1 Hiroshima University Hospital, Hiroshima city, Japan

2 Prefectural University of Hiroshima, Hiroshima city, Japan

3 Hiroshima University Hospital, Hiroshima, Japan

1 Department of Internal Medicine, Institute of Gastroenterology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea, Seoul, Republic of Korea, Korea, Republic of

1 Dong-A university, Busan, Republic of Korea, Korea, Republic of

1 Showa University Northern Yokohama Hospital, Digestive Disease Center, Yokohama, Japan

2 Showa University Northern Yokohama Hospital, Digestive Disease Center, Tokyo, Japan

1 Showa Medical University Northern Yokohama Hospital Digestive Disease Center, Yokohama, Japan

2 Kudo-Clinic, Akita, Japan

3 Municipal Kakunodate General Hospital, Semboku, Japan

4 Showa Medical University Northern Yokohama Hospital, Yokohama, Japan

1 Gunma University Graduate School of Medicine, Maebashi Gunma, Japan

2 Isesaki Municipal Hospital, Isesaki Gunma, Japan

3 Tomioka General Hospital, Tomioka Gunma, Japan

4 Saiseikai Maebashi Hospital, Maebashi Gunma, Japan

5 Maebashi Red Cross Hospital, Maebashi Gunma, Japan

6 Toho Hospital, Midori Gunma, Japan

7 National Hospital Organization Shibukawa Medical Center, Shibukawa Gunma, Japan

8 National Hospital Organization Takasaki General Medical Center, Takasaki Gunma, Japan

9 Haramachi Red Cross Hospital, Agatsuma Gunma, Japan

10 Kusunoki Hospital, Fujioka Gunma, Japan