Celiac Disease, Clostridium Difficile-Associated Diarrhea, Constipation,  Crohn’s Disease, Fabry Disease, Gastroenteritis, Gastroesophageal Reflux Disease (GERD), Gastroparesis, Heartburn, Hepatitis B, Hepatitis C, Inflammatory Bowel Disease, Irritable Bowel Syndrome (IBS), Ulcerative Colitis, Ulcers.