1 The University of Tokyo, Tokyo, Japan

2 Hyogo Medical University, Nishinomiya, Japan

3 Keio University School of Medicine, Tokyo, Japan

4 Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan

5 Fukuoka University Chikushi Hospital, Chikushino, Japan

6 Tokyo Women’s Medical University, Tokyo, Japan

7 Tohoku University Graduate School of Medicine, Sendai, Japan

8 Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan

9 Institute of Life Sciences, Mie University Graduate School of Medicine, Tsu, Japan

10 Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan

11 Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan

12 Tokyo Yamate Medical Center, Tokyo, Japan

13 Coloproctology Center Takano Hospital, Kumamoto, Japan

14 Toho University Sakura Medical Center, Chiba, Japan

15 Graduate School of Medical, Osaka University, Osaka, Japan

16 Yokohama City University Medical Center, Yokohama, Japan

17 Tohoku Rosai Hospital, Sendai, Japan

18 Kyoto University Hospital, Kyoto, Japan

19 Tokyo Medical and Dental University, Tokyo, Japan

20 Showa University Northern Yokohama Hospital, Kanagawa, Japan

21 Osaka Medical and Pharmaceutical University, Takatsuki, Japan

22 Faculty of Medicine, Kindai University, Osaka, Japan

23 Yokkaichi Hazu Medical Center, Yokkaichi, Japan

24 Tokai University School of Medicine, Tokyo, Japan

25 Nara Medical University, Nara, Japan

26 Fujita Health University, School of Medicine, Aichi, Japan

27 Aichi Cancer Center Hospital, Aichi, Japan

28 IMSUT Hospital, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan

29 Urasoe General Hospital, Okinawa, Japan

30 Kurume University Hospital, Kurume, Japan

31 Saitama Medical University International Medical Center, Saitama, Japan

32 National Defense Medical College, Tokorozawa, Japan

33 The Fraternity Memorial Hospital, Tokyo, Japan

34 Sapporo Higashi Tokushukai Hospital, Sapporo, Japan

35 Nishinomiya Municipal Central Hospital, Nishinomiya, Japan

36 Japanese Red Cross Medical Center, Tokyo, Japan

37 Kyorin University, Tokyo, Japan

38 Niigata University, Niigata, Japan

1 Graduate School, Kyung Hee University, Seoul, Korea, Republic of

2 Kyung Hee University Korean Medicine Hospital, Seoul, Korea, Republic of

3 Kyung Hee University, Seoul, Korea, Republic of

4 Kyung Hee Univ. Korean Medicine Hospital, Seoul, Korea, Republic of

1 Mohammed VI University Hospital, Marrakesh, Morocco

1 Zurich University Hospital, Zürich, Switzerland

2 Stadtspital Triemli, Zürich, Switzerland

1 Mayo Clinic, Jacksonville, United States

2 Icahn School of Medicine at Mount Sinai, New York City, United States

1 University Hospital Vienna, Vienna, Austria

2 University Hospital Graz, Graz, Austria

1 KU Leuven, Leuven, Belgium

2 University of Leuven, University Hospital Gasthuisberg, Leuven, Belgium