1. Department of Gastroenterology and Hepatology, Yokohama City University School of Medicine Graduate School of Medicine, Yokohama, Japan
2. Department of Gastroenterology, Yokohama Sakae Kyosai Hospital, Yokohama, Japan
3. Department of Palliative Medicine, International University Health and Welfare Narita Hospital, Narita, Japan
4. Department of Gastroenterology, International University Health and Welfare Narita Hospital, Narita, Japan
5. Departments of Clinical Cancer Genomics, Yokohama City University Hospital, Yokohama, Japan
6. Department of Gastroenterology, International University of Health and Welfare Atami Hospital, Atami, Japan
7. Department of Internal Medicine, Kanagawa Dental University Yokohama Clinic, Yokohama, Japan
8. Department of Internal Medicine, Namiki Koiso-Medical Clinic, Yokohama, Japan
9. Department of Biostatistics, JORTC Data Center, Tokyo, Japan
10. Division of Gastroenterology, Nippon Medical School, Tokyo, Japan
11. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore