1 Pusan National University Yangsan Hospital, Yangsan, Korea, Republic of

1 Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan

2 Ehime University Graduate School of Medicine, Ehime, Japan

3 Ehime University Hospital, Ehime, Japan

1 National Cancer Center Hospital East, Chiba, Japan

2 National Cancer Center, Chiba, Japan

1 Iwate Medical University, Yahaba, Japan

2 Tohoku University Graduate School of Medicine, Sendai, Japan

3 Iwate Prefectural Central Hospital, Morioka, Japan

4 Sendai City Medical Center, Sendai, Japan

5 Akita University Graduate School of Medicine, Akita, Japan

6 Yamagata University, Yamagata, Japan

7 Hirosaki University Graduate School of Medicine, Hirosaki, Japan

8 Fukushima Medical University Hospital, Fukushima, Japan

9 Aomori Prefectural Central Hospital, Aomori, Japan

10 Hiraka General Hospital, Yokote, Japan

11 Yamagata Prefectural Central Hospital, Yamagata, Japan

12 Tohoku University Graduate School of Medicine Division of Gastroenterology, Sendai, Japan

1 Osaka International Cancer Institute, Osaka, Japan

1 NTT medical center Tokyo, Tokyo, Japan

2 Osaka International Cancer Institute, Osaka, Japan

3 Kyorin University School of Medicine, Tokyo, Japan

4 Imamura Hospital, Saga, Japan

5 Yokohama City University Medical Center, Kanagawa, Japan

6 Iwate Prefectural Isawa Hospital, Iwate, Japan

7 Kagawa University, Kagawa, Japan

8 Osaka Red Cross Hospital, Osaka, Japan

9 Kansai Medical University Medical Center, Osaka, Japan

10 Akashi Medical Center, Hyogo, Japan

11 Omori Red Cross Hospital, Tokyo, Japan

12 Shizuoka Cancer Center, Shizuoka, Japan

13 Ehime Rosai Hospital, Ehime, Japan

1 Samsung Medical Center, Seoul, Korea, Republic of

2 Asan Medical Center, Seoul, Korea, Republic of