A study of the association between Crohn's disease and psychiatric illnessJohn E. Helzer, David Alpers|Gastroenterology|1984Cited by 173
Do Life Events or Depression Exacerbate Inflammatory Bowel Disease?Carol S. North, Ray E. Clouse, David Alpers et al.|Annals of Internal Medicine|1991Cited by 157
The relation of ulcerative colitis to psychiatric factors: a review of findings and methodsCarol S. North, David Alpers, Ray E. Clouse et al.|American Journal of Psychiatry|1990Cited by 143