Endoscopic treatment for proximal and distal malignant biliary obstruction - TAŞKIN, Vildan; SERBEST, Servet; YILDIRIM, Bülent; SARI, Ramazan; KARINCAOĞLU, Melih; ALADAĞ, Murat; HİLMİOĞLU, Fatih (Turkish Journal of Gastroenterology, 1998)