Preoperative evaluation of accessory hepatic ducts by drip infusion cholangiography with CT oleh Hiromichi Ishii, Akinori Noguchi, Tomoyuki Fukami, Riho Sugimoto, Hiroyuki Tada, Hiroki Takeshita, Seiji Umehara, Hiroyuki Izumi, Naoki Tani, Masahide Yamaguchi, Tetsuro Yamane