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Etiologies of chronic diarrhea for which diagnosis endoscopic biopsy sampling from apparently normal gastrointestinal mucosa is necessary
| Eosinophilic gastroenteritis |
| Microscopic colitis (collagenous colitis and lymphocytic colitis) |
| Amyloidosis |
| Celiac disease |
| Functional bowel disease (irritable bowel syndrome, functional diarrhea, and bile aid diarrhea) |
