Takagi T, Sugimoto M, Suzuki R, Konno N, Asama H, Sato Y, Irie H, Nakamura J, Takasumi M, Hashimoto M, Kato T, Kobashi R, Yanagita T, Hashimoto Y, Marubashi S, Hikichi T, Ohira H. Screening for hilar biliary invasion in ampullary cancer patients. World J Gastrointest Endosc 2022; 14(9): 536-546 [PMID: 36186943 DOI: 10.4253/wjge.v14.i9.536]