THE ULTRASONOGRAFIC ASSESMENT OF THE LEVELS AND CAUSES IN BILIARY OBSTRUCTION - CANER, M. Emin; HİLMİOĞLU, Fatih; BOYACIOĞLU, Sedat; Doğru, A. İhsan; TAŞ, İsmet; TEMUÇİN, Gülay; ŞAHİN, Burhan (Turkish Journal of Gastroenterology, 1992)