1. Center of Diabetes, Endocrine and Metabolism Toho University Sakura Medical Center Chiba Japan
2. Department of Surgery Iwate Medical University School of Medicine Iwate Japan
3. Department of Surgery Tohoku University Graduate School of Medicine Miyagi Japan
4. Department of Gastrointestinal Surgery University of Tokyo Tokyo Japan
5. Department of Frontier Surgery Graduate School of Medicine Chiba University Chiba Japan
6. Department of Endocrinology, Hematology and Gerontology Chiba University Graduate School of Medicine Chiba Japan
7. Department of Surgery Toho University Sakura Medical Center Chiba Japan
8. Department of Medicine Shiga University of Medical Science Shiga Japan
9. Department of Gastrointestinal Surgery Kusatsu General Hospital Shiga Japan
10. Department of Gastroenterological and Pediatric Surgery Faculty of Medicine Oita University Oita Japan
11. Division of Diabetes and Metabolism Department of Internal Medicine Iwate Medical University Iwate Japan
12. Weight Loss and Metabolic Surgery Center Yotsuya Medical Cube Tokyo Japan
13. Department of Internal Medicine School of Medicine Keio University Tokyo Japan
14. Department of Endocrinology, Metabolism, and Hypertension Clinical Research Institute National Hospital Organization Kyoto Medical Center Kyoto Japan
15. Department of Endocrinology Tokyo Metropolitan Tama Medical Center Tokyo Japan
16. Department of Surgery Tokyo Metropolitan Tama Medical Center Tokyo Japan
17. Department of Internal Medicine Mihama Hospital Chiba Japan
18. Internal Medicine Tokatsu‐Clinic Hospital Chiba Japan
19. Department of Medicine Division of Diabetes, Metabolism and Endocrinology Chiba University Hospital Chiba Japan
20. Department of Neuropsychiatry Toho University Sakura Medical Center Chiba Japan
21. Division of Gastroenterological Surgery Department of Surgery Graduate School of Medicine, Osaka University Osaka Japan
22. Department of Endocrinology, Metabolism, Rheumatology and Nephrology Faculty of Medicine Oita University Oita Japan
23. Nagayama Clinic Tochigi Japan
24. Faculty of Pharmaceutical Sciences Josai International University Chiba Japan