Gastrointestinal Diseases and Disorders: The Public Health Perspective. The Burden of Gastrointestinal and Liver Disease Around the World / Hannah P Kim, Seth D Crockett, Nicholas J Shaheen -- How to Critically Read the Gastrointestinal Epidemiology Literature. How to read a cohort study / Laila J Tata -- How to read a case-control study / Joe West, Laila J Tata, Timothy R Card -- How to Read a Randomized Controlled Clinical Trial / Matthew J Grainge -- How to Read a Systematic Review and Meta-Analysis / Alexander C Ford, Paul Moayyedi -- How to Decide if any of this Matters / Kate M Fleming, Timothy R Card -- How to do Clinical Research in GI. How to Develop and Validate a GI Questionnaire / Enrique Rey, G Richard Locke -- How to Do Population-Based Studies and Survey Research / Sanjiv Mahadeva, Hematram Yadav -- How to Find and Apply Large Databases for Epidemiologic Research / Jonas F Ludvigsson, Joe West, Jessica A Davila, Timothy R Card, Hashem B El-Serag -- How to Do Genetic and Molecular Epidemiologic Research / Yuri A Saito -- Diagnostic Studies / Paul Moayyedi -- Randomized Controlled Trials / Paul Moayyedi, Richard H Hunt -- Epidemiology of Major GI Diseases. Epidemiology of GERD, Barrett's Esophagus and Esophageal Cancer / David Armstrong -- Epidemiology of Infection, Peptic Ulcer Disease and Gastric Cancer / Grigorios I Leontiadis, Olof Nyrén -- Epidemiology of Dyspepsia / Alexander C Ford, Nicholas J Talley -- Epidemiology of Upper Gastrointestinal Bleeding / Colin J Crooks, Joseph Sung, Timothy R Card -- Epidemiology of Celiac Disease / Alberto Rubio-Tapia, Jonas F Ludvigsson, Joseph A Murray -- Measuring Utilization of Endoscopy in Clinical Practice / Frances Tse, Alan Barkun -- Epidemiology of Colorectal Carcinoma / Harminder Singh, Joselito M Montalban, Salaheddin Mahmud -- Epidemiology of Irritable Bowel Syndrome / Rok Seon Choung, Yuri A Saito -- Epidemiology of Constipation / Brain E Lacy, John M Levenick -- Epidemiology of diverticular disease / Robin Spiller, David Humes -- Epidemiology of Infectious Diarrhea / Christina M Surawicz, Crenguta Stepan -- Epidemiology of Inflammatory Bowel Disease / Edward V Loftus -- Epidemiology of Fecal Incontinence / Adil E Bharucha -- Epidemiology of Gallstones and Biliary Tract Cancers / Guy D Eslick, Eldon A Shaffer -- Epidemiology of Pancreatitis / Dhiraj Yadav, Santhi Swaroop Vege, Suresh T Chari -- Epidemiology of Pancreatic Cancer / Aravind Sugumar, Santhi Swaroop Vege -- Epidemiology of Hepatitis B and C in the United States / Sumeet K Asrani, W Ray Kim -- Epidemiology of Alcoholic Liver Disease / Sumeet K Asrani, William Sanchez -- Epidemiology of Cirrhosis and Hepatocellular Carcinoma / Joe West, Guruprasad P Aithal -- Epidemiology of Nonalcoholic Fatty Liver Disease (NAFLD) / Guruprasad P Aithal, Kshaunish Das, Abhijit Chowdhury -- Epidemiology of Common Tropical GI Diseases / Magnus Halland, Rodney Givney, Anne Duggan -- Nutritional Epidemiology and GI Cancers / Linda E Kelemen, Ilona Csizmadi -- The Epidemiology of Obesity among Adults / Cynthia L Ogden, Brian K Kit, Tala HI Fakhouri, Margaret D Carroll, Katherine M Flegal