| 1. | Achlorhydria (1 study) |
| 2. | Adenoma, Islet Cell (6 studies) |
| 3. | Alagille Syndrome (2 studies) |
| 4. | Anus Diseases (14 studies) |
| 5. | Anus Neoplasms (11 studies) |
| 6. | Appendiceal Neoplasms (1 study) |
| 7. | Barrett Esophagus (2 studies) |
| 8. | Bile Duct Diseases (33 studies) |
| 9. | Bile Duct Neoplasms (17 studies) |
| 10. | Biliary Atresia (2 studies) |
| 11. | Biliary Tract Diseases (36 studies) |
| 12. | Biliary Tract Neoplasms (19 studies) |
| 13. | Carcinoma, Hepatocellular (120 studies) |
| 14. | Carcinoma, Islet Cell (25 studies) |
| 15. | Caroli Disease (1 study) |
| 16. | Cecal Diseases (1 study) |
| 17. | Cecal Neoplasms (1 study) |
| 18. | Celiac Disease (1 study) |
| 19. | Cholangitis (2 studies) |
| 20. | Cholangitis, Sclerosing (2 studies) |
| 21. | Cholelithiasis (1 study) |
| 22. | Cholestasis (14 studies) |
| 23. | Cholestasis, Intrahepatic (7 studies) |
| 24. | Chyloperitoneum (1 study) |
| 25. | Colitis (22 studies) |
| 26. | Colitis, Ulcerative (17 studies) |
| 27. | Colonic Diseases (343 studies) |
| 28. | Colonic Diseases, Functional (7 studies) |
| 29. | Colonic Neoplasms (255 studies) |
| 30. | Colorectal Neoplasms (349 studies) |
| 31. | Colorectal Neoplasms, Hereditary Nonpolyposis (2 studies) |
| 32. | Congenital Hepatic Fibrosis (1 study) |
| 33. | CREST Syndrome (2 studies) |
| 34. | Crohn Disease (27 studies) |
| 35. | Cryptosporidiosis (17 studies) |
| 36. | Cystic Fibrosis (45 studies) |
| 37. | Deglutition Disorders (11 studies) |
| 38. | Digestive System Abnormalities (4 studies) |
| 39. | Digestive System Diseases (1069 studies) |
| 40. | Digestive System Neoplasms (771 studies) |
| 41. | Duodenal Diseases (20 studies) |
| 42. | Duodenal Neoplasms (20 studies) |
| 43. | Enteritis (5 studies) |
| 44. | Enterocolitis (4 studies) |
| 45. | Enterocolitis, Necrotizing (3 studies) |
| 46. | Enterocolitis, Pseudomembranous (1 study) |
| 47. | Eosinophilic Gastroenteritis (1 study) |
| 48. | Esophageal Achalasia (1 study) |
| 49. | Esophageal and Gastric Varices (3 studies) |
| 50. | Esophageal Diseases (140 studies) |
| 51. | Esophageal Motility Disorders (10 studies) |
| 52. | Esophageal Neoplasms (117 studies) |
| 53. | Esophagitis (7 studies) |
| 54. | Fatty Liver (6 studies) |
| 55. | Gallbladder Diseases (17 studies) |
| 56. | Gallbladder Neoplasms (16 studies) |
| 57. | Gastrinoma (24 studies) |
| 58. | Gastroenteritis (57 studies) |
| 59. | Gastroesophageal Reflux (3 studies) |
| 60. | Gastrointestinal Diseases (669 studies) |
| 61. | Gastrointestinal Neoplasms (549 studies) |
| 62. | Gastroparesis (2 studies) |
| 63. | Giardiasis (1 study) |
| 64. | Glucagonoma (18 studies) |
| 65. | Hepatic Encephalopathy (1 study) |
| 66. | Hepatitis (112 studies) |
| 67. | Hepatitis A (3 studies) |
| 68. | Hepatitis B (31 studies) |
| 69. | Hepatitis B, Chronic (15 studies) |
| 70. | Hepatitis C (61 studies) |
| 71. | Hepatitis C, Chronic (22 studies) |
| 72. | Hepatitis D (2 studies) |
| 73. | Hepatitis D, Chronic (1 study) |
| 74. | Hepatitis, Chronic (38 studies) |
| 75. | Hepatitis, Viral, Human (10 studies) |
| 76. | Hepatolenticular Degeneration (2 studies) |
| 77. | Hepatorenal Syndrome (1 study) |
| 78. | Hernia (6 studies) |
| 79. | Hernia, Diaphragmatic (1 study) |
| 80. | Hypertension, Portal (5 studies) |
| 81. | Ileal Diseases (21 studies) |
| 82. | Ileal Neoplasms (20 studies) |
| 83. | Ileitis (1 study) |
| 84. | Ileus (2 studies) |
| 85. | Inflammatory Bowel Diseases (43 studies) |
| 86. | Insulinoma (21 studies) |
| 87. | Intestinal Diseases (453 studies) |
| 88. | Intestinal Diseases, Parasitic (17 studies) |
| 89. | Intestinal Neoplasms (367 studies) |
| 90. | Intestinal Obstruction (5 studies) |
| 91. | Intestinal Volvulus (1 study) |
| 92. | Irritable Bowel Syndrome (7 studies) |
| 93. | Jejunal Diseases (20 studies) |
| 94. | Jejunal Neoplasms (20 studies) |
| 95. | Liver Cirrhosis (34 studies) |
| 96. | Liver Cirrhosis, Alcoholic (1 study) |
| 97. | Liver Cirrhosis, Biliary (5 studies) |
| 98. | Liver Diseases (274 studies) |
| 99. | Liver Failure (5 studies) |
| 100. | Liver Failure, Acute (2 studies) |
| 101. | Liver Neoplasms (137 studies) |
| 102. | Malabsorption Syndromes (4 studies) |
| 103. | Non-Alcoholic Steatohepatitis (5 studies) |
| 104. | Pancreatic Diseases (212 studies) |
| 105. | Pancreatic Insufficiency (1 study) |
| 106. | Pancreatic Neoplasms (164 studies) |
| 107. | Pancreatitis (4 studies) |
| 108. | Pancreatitis, Acute Necrotizing (2 studies) |
| 109. | Peptic Ulcer (9 studies) |
| 110. | Peritoneal Diseases (15 studies) |
| 111. | Peritoneal Neoplasms (14 studies) |
| 112. | Peritonitis (1 study) |
| 113. | Peutz-Jeghers Syndrome (1 study) |
| 114. | Porphyria Cutanea Tarda (1 study) |
| 115. | Porphyria, Acute Intermittent (1 study) |
| 116. | Porphyria, Erythrohepatic (2 studies) |
| 117. | Porphyria, Hepatic (1 study) |
| 118. | Pouchitis (1 study) |
| 119. | Rectal Diseases (308 studies) |
| 120. | Rectal Neoplasms (241 studies) |
| 121. | Short Bowel Syndrome (2 studies) |
| 122. | Sigmoid Diseases (2 studies) |
| 123. | Sigmoid Neoplasms (2 studies) |
| 124. | Somatostatinoma (19 studies) |
| 125. | Stomach Diseases (100 studies) |
| 126. | Stomach Neoplasms (91 studies) |
| 127. | Variceal Bleeding (1 study) |
| 128. | Vipoma (1 study) |
| 129. | Zellweger Syndrome (2 studies) |
| 130. | Zollinger-Ellison Syndrome (7 studies) |
