Influence of Bile Duct Diameter on the Therapeutic Quality of Endoscopic Balloon Sphincteroplasty - Ohashi, A; Tamada, K; Tomiyama, T; Aizawa, T; Wada, S; Miyata, T; Nishizono, T; Tano, S; Sato, Y; Ueno, N; Ido, K; Kimura, K (Endoscopy, 1999)