Gastrointestinal Diseases and Disorders Sourcebook: Basic Consumer Health Information About the Upper and Lower Gastrointestinal (GI) Tract, Including the Esophagus, Stomach, Intestines, Rectum, Liver, and Pancreas, With Facts About Gastroesophageal Reflux Disease, Gastritis, Hernias, Ulcers, Celiac Disease, Diverticulitis, Irritable Bowel Syndrome, Hemorrhoids, Gastrointestinal Cancers, and Other Diseases and Disorders Related to the Digestive Process; Along With Information About Commonly Used Diagnostic and Surgical Procedures, Statistics, Reports on Current Research Initiatives and Clinical Trials, a Glossary, and Resources for Additional Help and Information