Endoscopic sphincterotomy in periampullary diverticula - UZUN, Yusuf; SOYKAN, İrfan and ÇETİNKAYA, Hülya and KARAYALÇIN, Selim and ÖRMECİ, Necati and BEYLER, Ali Reşit and YAŞA, Hadi and YURDAYDIN, Cihan and DÖKMECİ, Abdulkadir and; R, Kadir (Turkish Journal of Gastroenterology, 1999)