1. Department of Endocrinology and Diabetes Mellitus, Faculty of Medicine, Fukuoka University, Fukuoka 814-0180, Japan
2. Department of Community and Family Medicine, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan
3. Division of Metabolism and Endocrinology, Department of Internal Medicine, St. Marianna University School of Medicine Yokohama City Seibu Hospital, Yokohama 241-0811, Japan
4. Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Suita 565-0871, Japan
5. Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
6. Department of Clinical Cell Biology and Medicine, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
7. Department of Medicine and Bioregulatory Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
8. Department of Nutritional Sciences, Nakamura Gakuen University, Fukuoka 814-0198, Japan
9. Doi Clinic, Kumamoto 861-5255, Japan
10. Department of Diabetes and Endocrinology, Saiseikai Yokohamashi Tobu Hospital, Yokohama 230-0012, Japan