Tissue Sampling using a Submucosal Tunnelling Technique for Indefinite Gastric Amyloidosis - Hideki Kobara; Makoto Oryu; Hirohito Mori; Shintaro Fujihara; Noriko Nishiyama; Yasuhiro Goda; Taiga Chiyo; Tae Matsunaga; Maki Ayaki; Tatsuo Yachida; Toshiaki Nakatsu; Tsutomu Masaki (Canadian Journal of Gastroenterology and Hepatology, 2015)