1. Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, Japan
2. Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Japan
3. Department of Hepato-Biliary-Pancreatic Surgery and Transplantation, Kyoto University Graduate School of Medicine, Japan
4. Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Japan
5. Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, Japan
6. Department of Gastroenterology, Kobe University Graduate School of Medicine, Japan
7. Clinical Research Center, National Hospital Organization Kyoto Medical Center, Japan