Download or read book Deja Review Surgery 2nd Edition written by Amit D. Tevar and published by McGraw Hill Professional. This book was released on 2011-07-22 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Flashcards in a book" provide a comprehensive yet concise review for the surgery clerkship Maximum retention in minimum time! Drawn from the perspective of residents fresh from their medical school and USMLE experiences, these unique "flashcards in a book" help you remember high-yield facts in the least amount of time possible and focus on what is essential for success on the shelf exam and the USMLE Step 2 CK. Active recall Q&A boils down must-know concepts for clerkship success Clinical vignettes at the end of the book put content in clinical context Mnemonics and key words help you focus on core facts 100 high-yield images Complements larger course books and works well with other type of review books Convenient 6"x9" size is great for study on the go The content you need for clerkship success: Chapter 1. Esophagus; Chapter 2. Stomach; Chapter 3. Small Bowel; Chapter 4. Colon; Chapter 5. Anorectal; Chapter 6. Spleen; Chapter 7. Hernia; Chapter 8. Liver; Chapter 9. Gallbladder; Chapter 10. Pancreas; Chapter 11. Endocrine; Chapter 12. Trauma; Chapter 13. Critical Care; Chapter 14. Burns; Chapter 15. Wound Healing, Skin and Soft Tissue, and Plastic Surgery; Chapter 16. Breast; Chapter 17. Pediatric Surgery; Chapter 18. Vascular Surgery; Chapter 19. Cardiothoracic Surgery; Chapter 20. Transplant; Chapter 21. ENT; Chapter 22. Bariatric Surgery; Chapter 23. Urology; Chapter 24. Neurosurgery; Chapter 25. Orthopedics; Index

Download or read book Deja Review Histology Cell Biology Second Edition written by Jae W. Song and published by McGraw Hill Professional. This book was released on 2010-12-17 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sales Handle This high-yield, rapid-fire Q&A book simulates flashcards in a book to help first and second year medical students review histology and medical cell biology for their course exams as well as prepare for the USMLE Step 1. About the Book The Deja Review series helps you Remember what you already know; the flashcard format helps medical students recall the most important, must-know facts and concepts covered in their course work for histology and medical cell biology. This rapid-fire question & answer review book allows students to quickly navigate through the information needed for their course exams and USMLE Step 1. Active recall questions reinforce correct answers to enhance learning - not just passive memorization. This book will publish with seven other basic science books in the Deja Review series, along with USMLE Step1 and USMLE Step 2 review books for a total of 10 new editions of Deja Review in 2010. Features Active recall Q&A format simulates flashcards in a book. Keywords and mnemonics highlighted throughout the text. High-Yield diagrams. NEW: Histological images Numerous correlations with pathology and pahtophysiology to help students tie together basic facts with clinical medicine. Expanded clinical vignette review questions at the end of each chapter. Contributions by med students who just aced the USMLE Step 1. Written by top students who just took the Step 1 exam. Two column format allows for ?flashcard? use of Q&A USMLE-format vignettes at the end of each chapter provide review of material covered in a clinical presentation. Clinical correlations of basic science throughout the text help students prepare for course work and board exams. Content complements other review material and works in conjunction with other larger course books. Portable size for use on the go Chapters written by med students ensures the most up-to-date coverage of content actually covered on course exam and USMLE Market/Audience Primary Market: First and second year US and Canadian medical students preparing for USMLE Step 1: 17,000 Secondary Market: International MD USMLE Step 1 test-takers: 16,000 DO Students USMLE Step 1 test-takers: 1,500 Author Profiles Ricky Darnell Grisson, II, MD, (Boston, MA) Pathology resident at Massachusetts General Hospital, Boston, MA. Graduated from Harvard Medical School magna cum laude NPP. Jae W. Song, MD, (Ann Arbor, MI) Surgery resident at University of Michigan Health Systems, Ann Arbor, MI. Graduated from New York University School of Medicine, New York City with Honors in Cell Biology as part of a 6-year Research Program.

Download or read book Deja Review Surgery written by Amit D. Tevar and published by McGraw Hill Professional. This book was released on 2007-09-22 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flash cards in a book for the Surgery shelf exam and the USMLE Step 2 CK -- written by students for students "The authors have done a great job in assimilating surgery essentials with anatomy, embryology, high-yield recall questions, clinical case presentations, definitions, physical diagnosis, common presenting signs and symptoms, and significance of lab findings. In addition to that, they have successfully packed the book with powerful illustrative images....It is a packed resource for the wards, for the shelf exam, as well as for Step 2."--Sanober A. Amin, MD/PhD Candidate, Class of 2008, UIC College of Medicine Deja Review: Surgery boils down your course work to just the critical concepts. Presenting the perspectives of top students from their shelf exams and the USMLE Step 2 CK, this unbeatable guide features a quick-read Q&A format -- one that helps you efficiently get through a large amount of information. It also allows you to zero-in on only correct answers in order to promote memory retention and maximize your study time. FEATURES: Flashcards in a book format for maximum retention Perfect for last-minute clerkship and board review Written by top medical students who just aced the USMLE Step 2 CK All-inclusive yet concise coverage of surgery Study-enhancing tips, mnemonics, and insider advice Clinical vignettes chapter preps you for cases you'll see on the exam

Download or read book Self Assessment in Obstetrics and Gynaecology by Ten Teachers 2E EMQs MCQs SAQs OSCEs written by Catherine EM Aiken and published by CRC Press. This book was released on 2012-07-27 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents medical students and those preparing for postgraduate examinations with an ideal opportunity to assess their levels of knowledge and understanding in obstetrics and gynaecology, and to practice their exam technique across a range of question formats. It can be used as a standalone revision guide, but is also designed to complement the latest editions of the best-selling volumes Gynaecology by Ten Teachers and Obstetrics by Ten Teachers. Key features: Includes an extensive range of question types—EMQs, MCQs, SBAs, SAQs, and OSCEs—providing comprehensive coverage compatible with all relevant examinations Fully up-to-date—ensuring prospective candidates practice across all areas on which they will be tested Clear and accessible— with concise explanations of answers and directions to the Ten Teachers textbooks for those seeking further advice and guidance With coverage across the obstetrics and gynaecology curriculum, medical students and those studying for for DRCOG and MRCOG examinations will find Self Assessment in Obstetrics and Gynaecology by Ten Teachers provides invaluable practice and guidelines during the critical revision period.

Download or read book NMS Medicine Casebook written by Tilak Shah and published by Lippincott Williams & Wilkins. This book was released on 2008-11-01 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organized by subspecialty, this case-based review covers all the information students are expected to learn during their internal medicine clerkship. Each topic begins with a brief patient history and a question about the most likely diagnosis or next step in management followed by a discussion of alternative diagnoses and management strategies. The user-friendly approach includes numerous algorithms, images, mnemonics, and tables. A companion Website will offer the fully searchable text.

Download or read book Deja Review USMLE Step 2 CK Second Edition written by John H. Naheedy and published by McGraw Hill Professional. This book was released on 2010-04-04 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ace the USMLE Step 2 CK with these unique “flashcards in a book”! Students who just took the USMLE Step 2 CK reveal what it takes to excel! "I highly recommend this book for Step 2 review. This is useful because it has a consistent, straightforward question and answer format. The answers are short and to the point, which makes it easy for self-tests. The 'make a diagnosis' sections are very helpful )and reflective) of shelf exam questions. I will be sure to let my classmates know this is a great resource!" -- Jesicca Bury, Mayo Clinic College of Medicine, Class of 2010 "Deja Review is jam-packed with key concepts and important details. I like the Q&A format, and that you can cover up the answers. It forces you to interact with the material and actively recall information rather than just reading the information. The book fits perfectly in the white coat pocket so it can be carried around and whipped out during slow times." -- Tina Nguyen, SUNY Upstate Medical University, Class of 2008 Deja Review: USMLE Step 2 CK boils down your coursework to just the critical concepts you ned to know for exam success. This unbeatable guide features a quick-read, two-column "flashcard" Q&A format--specifically designed to help you remember a large amount of pertinent information in the least amount of time possible. The format allows you to zero in on only the correct answers in order to promote memory retention and get the most out of your study time. Great for last-minute review of high-yield facts, Deja Review provides a straighforward way for you to assess your strengths and weaknesses for USMLE Step 2 CK success. You will find everything you need to ace the exam, including: Active recall questions that allow you to understand, not just memorize, the content “Make a Diagnosis” clinical vignettes at the ends of chapters that prepare you for board questions Mnemonics and key words to help you focus on core facts A portable size for study on the go--fits in your white coat pocket A bookmark included to help you work through easy-to-use flashcard presentation The Content You Need to Excel on the USMLE Step 2 CK: Internal Medicine, Surgery, Neurology, Psychiatry, Obstetrics and Gynecology, Pediatrics, Emergency Medicine, Abbreviations

Download or read book Deja Review USMLE Step 1 Second Edition written by John H. Naheedy and published by McGraw Hill Professional. This book was released on 2010-04-04 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ace the USMLE Step 1 with these unique “flashcards in a book”! Students who just aced the USMLE Step 1 reveal what it takes to excel! "This book was excellent, and well organized. The 'make the diagnosis' section was great--lengthy and thorough--just like Step 1. It was nice because it was compact enough that you could fit it in your bag and review it anywhere. Great!" -- Sarah Fabiano, SUNY Upstate Medical University, Class of 2010 "I like the fact that embryology for each system is given at the beginning of each chapter. This series is a wonderful compendium throughout the medical college years, particularly preclinical years to prepare for Step 1." -- Ali Rizvi, MPH, Lake Erie College of Osteopathic Medicine, Class of 2010 Deja Reveiw: USMLE Step 1 boils down your coursework to just the critical concepts you need to know for exam success. This unbeatable guide features a quick-read, two-column "flashcard" Q&A format--specifically designed to help you remember a large amount of pertinent information in the least amount of time possible. The format allows you to zero in on only the correct answers to promote memory retention and get the most out of your study time. Great for last-minute review of high-yield facts, Deja Review provides a straightforward way for you to assess your strengths and weaknesses for USMLE Step 1 success. You will find everything you need to ace the exam, including: Active recall Q&A that allow you to understand, not just memorize, the content “Make a Diagnosis” clinical vignettes that put the material in clinical context Mnemonics and key words to help you focus on core concepts Portable size for study on the go--fits in your white coat pocket Bookmark included to help you work through easy-to-use flashcard presentation The Content You Need to Ace the USMLE Step 1: Basic Principles,Immunology,Microbiology and Infectious Diseases,Neuroscience,Cardiovascular,Pulmonary,Gastroenterology,Reproduction and Endocrinology,Renal and Genitourinary,Hematology and Oncology,Skin and Connective Tissues,Musculoskeletal,Behavioral Sciences,Make the Diagnosis,Abbreviations.

Download or read book Deja Review Neuroscience Second Edition written by Matthew Tremblay and published by McGraw Hill Professional. This book was released on 2010-07-26 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sales Handle This high-yield, rapid-fire Q&A book simulates flashcards in a book to help first and second year medical students review neuroscience for their course exams as well as prepare for the USMLE Step 1. About the Book The Deja Review series helps you Remember what you already know; the flashcard format helps medical students recall the most important, must-know facts and concepts covered in their course work for neuroscience. This rapid-fire question and answer review book allows students to quickly navigate through the information needed for their course exams and USMLE Step 1. Active recall questions reinforce correct answers to enhance learning - not just passive memorization. Neuroscience is a required course in many medical schools, some consider it one of the most difficult, and heavily covered on USMLE Step 1. Mnemonics and keywords sprinkled throughout the text facilitate focus on core facts, while clinical vignettes at the end of each chapter allow students to reflect on the topic they have just read. This book will publish with seven other basic science books in the Deja Review series, along with USMLE Step1 and USMLE Step 2 review books for a total of 10 new editions of Deja Review in 2010. BBD: 6/18/2010 In-Store Date: 7/1/2010 Pub Month: July 2010 Features Active recall Q&A format simulates flashcards in a book. Keywords and mnemonics highlighted throughout the text. High-Yield diagrams. Content integrated across organ systems to help students understand clinical presentation of basic neuroscience. Clinical vignette review questions at the end of each chapter. Contributions by med students who just aced the USMLE Step 1. Two column format allows for flashcard use of Q and A USMLE-format vignettes at the end of each chapter provide review of material covered in a clinical presentation. Clinical correlations of basic science throughout the text help students prepare for course work and board exams Content complements other review material and works in conjunction with other larger course books. Portable size for use on the go Chapters written by med students ensures the most up-to-date coverage of content actually covered on course exam and USMLE Market/Audience Primary Market: First and second year US and Canadian medical students preparing for USMLE Step 1: 17,000 Secondary Market: International MD USMLE Step 1 test-takers: 16,000 DO Students USMLE Step 1 test-takers: 1,500 Author Profile Matthew Tremblay (Bronx, NY) is a MD / PhD candidate at Albert Einstein College of Medicine, Bronx, NY with a concentration: Alzheimer's Disease Pathogenesis Reviews "I liked the format of the a lot and it made me a bit disappointed that I didn't try to sue the other books from the series. I like learning from the short question/vignette followed by answer format and this book is a great example." -- Eric Chanowski, University of Michigan " I would recommend this book to my classmates, and in fact have already recommended the series to student who will begin medical school this fall." -- Joshua Lynch, Lake Erie College of Osteopathic Medicine

Download or read book Deja Review Microbiology Immunology written by Eric Chen and published by McGraw Hill Professional. This book was released on 2006-10-18 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accelerated answers for the microbiology and immunology course exams and the USMLE Step 1-written by students, for students This book covers all of the important topics for the USMLE as well as everyday information that will be used in class and clinic." -- Darin K. Winn, M4, University of Utah School of Medicine This is the easiest study aid to use for last minute studying." -- David K. Lee, M2, Harvard Medical School If you're a medical student on the go, gearing up for the microbiology and immunology course/shelf exam and the USMLE Step 1 exam can present a big challenge. How do you boil down your microbiology and immunology course work into only the most critical concepts, so you can have the edge at exam time? Deja Review: Microbiology & Immunology is the resource that gets you there. Drawn from the perspectives of top students fresh from their course exams and the USMLE Step 1, this unbeatable, portable guide features a quick-read Q&A format-one that helps you efficiently plow through a large amount of pertinent information. It also allows you to zero in on only correct answers to promote memorization and optimize your study time. Features Written by top medical students who just aced the USMLE Step 1 All-inclusive yet concise coverage of microbiology and immunology Study-enhancing tips, mnemonics, and insider advice Clinical vignettes chapter lets you renew material likely to appear on the USMLE Step 1 and the course exams

Download or read book The Surgeon s Daughter written by Audrey Blake and published by Sourcebooks, Inc.. This book was released on 2022-05-10 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: SheReads Best Historical Fiction Of Summer 2022! "This is an intense, suspenseful, and insightful read about the challenges both women and doctors faced in the 19th century...Our heroine rises to the challenge with courage and determination." —Historical Novel Society From the USA Today bestselling author of The Girl in His Shadow comes a riveting historical fiction novel about the women in medicine who changed the world forever. Women's work is a matter of life and death. Nora Beady, the only female student at a prestigious medical school in Bologna, is a rarity. In the 19th century women are expected to remain at home and raise children, so her unconventional, indelicate ambitions to become a licensed surgeon offend the men around her. Everything changes when she allies herself with Magdalena Morenco, the sole female doctor on-staff. Together the two women develop new techniques to improve a groundbreaking surgery: the Cesarean section. It's a highly dangerous procedure and the research is grueling, but even worse is the vitriolic response from men. Most don't trust the findings of women, and many can choose to deny their wives medical care. Already facing resistance on all sides, Nora is shaken when she meets a patient who will die without the surgery. If the procedure is successful, her work could change the world. But a failure could cost everything: precious lives, Nora's career, and the role women will be allowed to play in medicine. Perfect for book clubs and for fans of Marie Benedict, Tracey Enerson Wood, and Sarah Penner comes a captivating celebration of women healthcare workers throughout history.

Download or read book Deja Review Microbiology Immunology Second Edition written by Eric Chen and published by McGraw Hill Professional. This book was released on 2010-07-09 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: MAXIMUM RETENTION--MINIMAL TIME "I wish I had a copy of this book during my microbiology course ... excellent for classroom studies during the first two years of medical school." -- Judy Vu, Third Year Medical Student, University of Utah School of Medicine "I really enjoyed 'pimping' friends with questions from this book as a review for Step 1." -- Pete Pelletier, Third Year Medical Student, University of Utah School of Medicine "This excellent book covers the material second year medical students need to study for exams. It could easily be used in a small group to review. 3 Stars."--Doody's Review Service Deja Review: Microbiology and Immunology boils down your coursework to just the critical concepts you need to know for exam success. This unbeatable guide features a quick-read, two-column "flashcard" Q&A format--specifically designed to help you remember a large amount of pertinent information in the least amount of time possible. The format allows you to zero-in on only the correct answers to promote memory retention and get the most out of your study time. Great for last minute review of high-yield facts, Deja Review provides a straightforward way for you to assess your strengths and weaknesses so you can excel on your course exams and the USMLE Step 1. Active recall questions allow you to understand, not just memorize, the content Clinical vignettes at the end of chapters prepare you for board-style questions Portable size for study on the go--fits in your white coat pocket Bookmark included to guide you through easy-to-use flashcard presentation

Download or read book The Physician written by Noah Gordon and published by Open Road Media. This book was released on 2012-06-05 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt: An orphan leaves Dark Ages London to study medicine in Persia in this “rich” and “vivid” historical novel from a New York Times–bestselling author (The New York Times). A child holds the hand of his dying mother and is terrified, aware something is taking her. Orphaned and given to an itinerant barber-surgeon, Rob Cole becomes a fast-talking swindler, peddling a worthless medicine. But as he matures, his strange gift—an acute sensitivity to impending death—never leaves him, and he yearns to become a healer. Arab madrassas are the only authentic medical schools, and he makes his perilous way to Persia. Christians are barred from Muslim schools, but claiming he is a Jew, he studies under the world’s most renowned physician, Avicenna. How the woman who is his great love struggles against her only rival—medicine—makes a riveting modern classic. The Physician is the first book in New York Times–bestselling author Noah Gordon’s Dr. Robert Cole trilogy, which continues with Shaman and concludes with Matters of Choice.

Download or read book Topics in Primary Care Medicine written by Thomas F. Heston and published by BoD – Books on Demand. This book was released on 2021-01-14 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The medical specialty of primary care addresses the basic and fundamental healthcare needs of individuals, the family, and the larger community. Its reach starts at pre-conception and extends to global health and medical issues. Primary care issues include chronic medical problems, surgery, and community-wide health threats such as worldwide global pandemics, terrorism in all of its forms, and domestic violence. This book reviews eight topics including chronic medical issues like chronic fatigue syndrome, the response of primary care clinicians to global pandemics, and how patients and physicians are symbolized in comics. From top experts in the field, this book will improve your ability to practice primary care and to appreciate the broad demands placed upon primary care clinicians.

Download or read book To Ride Pegasus written by Anne McCaffrey and published by Del Rey. This book was released on 2002-04-09 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: “McCaffrey's world of the Talented is as vivid as that of Pern and its dragons.”—Publishers Weekly When a freak accident furnishes solid scientific proof of paranormal mental abilities, the world reacts with suspicion and fear. How can ordinary people coexist with a minority able to read minds, heal with a touch, peer into the future, or move objects with a thought? How can anyone with such power be trusted not to abuse it? Harsh repression seems the only answer Gifted with precognitive talent, Henry Darrow has other ideas, foreseeing a future in which the Talents are accepted for what they are and not what they can offer their fellow humans. But the road to that future will not be easy. Darrow and the powerful telepath Daffyd op Owen must win the public's trust while overcoming the threat of rogue Talents like Solange Boshe, a young girl so consumed with hatred that her thoughts can kill, and the singer known as Amalda, whose telepathic prowess can unite a thousand strangers in joyful harmony—or mold them into a bloodthirsty mob. . . .

Download or read book Deja Review Microbiology and Immunology Third Edition written by Eric Chen and published by McGraw Hill Professional. This book was released on 2020-04-10 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product. Maximum Retention in Minimal Time! This high-yield, rapid-fire Q&A book simulates flashcards in a book to help you review microbiology and immunology for your course exams as well as prepare for the USMLE Step 1. The convenient two-column “flashcard” Q&A format reinforces familiar material, while accelerating mastery of commonly tested topics. You’ll efficiently absorb a large amount of pertinent information and streamline study time by focusing only on the correct answers. Ideal for studying when time is limited, Deja Review: Microbiology and Immunology lets you review in a way that helps you cover a lot of questions in a short period of time. Features • Ideal, two-column flashcard-like format helps you review a large amount of questions when time is limited • Active recall, high yield questions help you understand, not just memorize, the content • Clinical vignettes at the end of each chapter prepare you for coursework and board exams • Portable size for convenient study on the go—fits in your white coat pocket • Array of useful mnemonics for maximizing your retention of the content

Download or read book The Persian Boy written by Mary Renault and published by Open Road Media. This book was released on 2013-09-10 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: A New York Times–bestselling novel of the ancient king of Macedon and his lover by the author Hilary Mantel calls “a shining light.” The Persian Boy centers on the most tempestuous years of Alexander the Great’s life, as seen through the eyes of his lover and most faithful attendant, Bagoas. When Bagoas is very young, his father is murdered and he is sold as a slave to King Darius of Persia. Then, when Alexander conquers the land, he is given Bagoas as a gift, and the boy is besotted. This passion comes at a time when much is at stake—Alexander has two wives, conflicts are ablaze, and plots on the Macedon king’s life abound. The result is a riveting account of a great conqueror’s years of triumph and, ultimately, heartbreak. The Persian Boy is the second volume of the Novels of Alexander the Great trilogy, which also includes Fire from Heaven and Funeral Games. This ebook features an illustrated biography of Mary Renault including rare images of the author. “Mary Renault is a shining light to both historical novelists and their readers. She does not pretend the past is like the present, or that the people of ancient Greece were just like us. She shows us their strangeness; discerning, sure-footed, challenging our values, piquing our curiosity, she leads us through an alien landscape that moves and delights us.” —Hilary Mantel

Download or read book Deja Review Pharmacology Second Edition written by Jessica Gleason and published by McGraw Hill Professional. This book was released on 2010-07-26 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: MAXIMUM RETENTION--MINIMAL TIME "This is an excellent review of pharmacology for the student who is looking to identify his/her strengths and weaknesses prior to the exam." -- Alexis Dallara, Fourth Year Medical Student, SUNY Downstate College of Medicine "The beauty of this text is that it includes essential pharmacology concepts in a compact book that can be quickly referenced and read multiple times during the course of a student's studies. I would definitely recommend it to any medical student." -- Rosalyn Pham, Fourth Year Medical Student, University of Washington Medical School Deja Review: Pharmacology boils down your coursework to just the critical concepts you need to know for exam success. This unbeatable guide features a quick-read "flashcard" Q&A format--specifically designed to help you remember a large amount of pertinent information in the least amount of time possible. The format allows you to zero-in on only the correct answers to promote memory retention and get the most out of your study time. Great for last minute review of high-yield facts, Deja Review provides a straightforward way for you to assess your strengths and weaknesses so you can excel on your course exams and the USMLE Step 1. Active recall questions allow you to understand, not just memorize, the content Clinical vignettes at the end of chapters prepare you for board-style questions Portable size for study on the go--fits in your white coat pocket Bookmark included to guide you through easy-to-use flashcard presentation