1. Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway
2. Clinical Effectiveness Research Group, Oslo University Hospital, Oslo, Norway
3. Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan
4. Section for Gastroenterology, Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway
5. Division of Endoscopy, Shizuoka Cancer Center, Shizuoka, Japan
6. Department of Endoscopy, Tokyo Medical and Dental University, Tokyo, Japan
7. Department of Gastroenterology, The Cancer Institute Hospital, Tokyo, Japan
8. Department of Gastroenterology and Endoscopy, National Cancer Center Hospital East, Kashiwa, Japan
9. Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
10. Division of Gastroenterology and Hepatology, Toho University Omori Medical Center, Tokyo, Japan
11. Graduate School of Informatics, Nagoya University, Nagoya, Japan