Hiroyuki Isayama 1, Kazumichi Kawakubo 1, Yousuke Nakai 1, Hirofumi Kogure 1, Tsuyoshi Hamada 2, Osamu Togawa 1, Rie Nagano 3, Hiroshi Yagioka 4, Yukiko Ito 2, Saburo Matsubara 5, Takashi Sasaki 1, Natsuyo Yamamoto 1, Naoki Sasahira 1, Kenji Hirano 1, Nobuo Toda 6, Minoru Tada 1, Kazuhiko Koike 1
1 Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
2 Gastroenterology, Japanese Red Cross Medical Center, Tokyo, Japan
3 Gastroenterology, Kanto Central Hospital, Tokyo, Japan
4 Gastroenterology, JR Tokyo General Hospital, Tokyo, Japan
5 Gastroenterology, Tokyo Metropolitan Police Hospital, Tokyo, Japan
6 Gastroenterology, Mitsui Memorial Hospital, Tokyo, Japan