Proportion of lymphocytic colitis cases in patients with unexplained diarrhea: The result of a prospective study - ERDEM, Levent; YILDIRIM, Sadık; AKIN, Onat; YILMAZ, Banu; GÜLTEKİN, Orhan S.; KÖKSAL, Hakan; PEKER, Önder (Turkish Journal of Gastroenterology, 2000)