1. Department of Nephrology and Endocrinology, The University of Tokyo Graduate School of Medicine, Tokyo 113-8655, Japan
2. Department of Endocrinology, Metabolism and Hypertension Research, Clinical Research Institute, National Hospital Organization, Kyoto Medical Center, Kyoto 612-8555, Japan
3. Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
4. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
5. Second Department of Internal Medicine (Endocrinology, Diabetes and Metabolism, Hematology, Rheumatology), Graduate School of Medicine, University of the Ryukyus, Okinawa 903-0213, Japan
6. Department of Diabetes, Endocrinology and Hematology, Dokkyo Medical University Saitama Medical Center, Saitama 343-8555, Japan
7. Department of Endocrinology, Diabetes and Metabolism, Fujita Health University, School of Medicine, Aichi 470-1192, Japan
8. Department of Endocrinology and Diabetes, Nagoya University Graduate School of Medicine, Aichi 466-8550, Japan
9. Department of Metabolic Syndrome and Nutritional Science, Research Institute of Environmental Medicine, Nagoya University, Aichi 466-8550, Japan