TY - GEN AU - Switz,D M AU - Zfass,A M AU - Heuman,D M TI - Endoscopic treatment of biliary tract disease SN - 0146-3616 PY - 1987///0310 KW - Aged KW - Ampulla of Vater KW - surgery KW - Cholangiopancreatography, Endoscopic Retrograde KW - Gallstones KW - diagnosis KW - Humans KW - Intraoperative Care KW - Middle Aged N1 - Publication Type: Journal Article ER -