Novel biliary drainage of a choledochojejunal anastomotic stenosis using a double-balloon endoscope and forward-viewing endoscopic ultrasound - Maehara, Kosuke; Hijioka, Susumu; Sakamoto, Taku; Maruki, Yuta; Tamada, Kiichi; Okusaka, Takuji; Saito, Yutaka (Endoscopy, 2020)