Diagnostic utility of digital cholangioscopy for dislodged bile duct tumor thrombus of hepatocellular carcinoma - Inoue, Tadahisa; Ohashi, Tomohiko; Nakade, Yukiomi; Kobayashi, Yuji; Ishii, Norimitsu; Ito, Kiyoaki; Yoneda, Masashi (Endoscopy, 2017)