ENDOSCOPIC MANAGEMENT OF DUODENAL AND JEJUNAL POLYPOSIS IN PATIENTS WITH FAMILIAL ADENOMATOUS POLYPOSIS USING DOUBLE BALLOON ENDOSCOPY - Sekiya, M; Sakamoto, H; Yano, T; Miyahara, S; Nagayama, M; Tojo, H; Kobayashi, Y; Shinozaki, S; Sunada, K; Kawarai Lefor, A; Yamamoto, H (Endoscopy, 2019)