Efficacy of intraoperative cholangioscopy on identification of the perforation site for patients with periampullary perforation after endoscopic sphincterotomy: a case report - Sakata, Jun; Hirose, Yuki; Takizawa, Kazuyasu; Ishikawa, Hirosuke; Kobayashi, Takashi; Wakai, Toshifumi (Tando, 2024)