ENDOSCOPIC ASSESMENT OF UPPER GASTROINTESTINAL SYSTEM IN PATIENTS WITH CHRONIC RENAL FAILURE - ONAT, Osman; DEMİR, Ali; ÇELİKER, Hüseyin; LÜLECİ, Cemal; YILDIRIM, Ahmet; ELMACI, Hüseyin Cahit (Turkish Journal of Gastroenterology, 1993)