1. Endocrinology and Diabetes Center, Yokohama Rosai Hospital, Yokohama, Japan
2. Division of Clinical Hypertension, Endocrinology and Metabolism, Tohoku University Graduate School of Medicine, Division of Nehrology, Endocrinology and Vascular Medicine, Tohoku University Hospital, Sendai, Japan
3. Department of Endocrinology and Diabetes Mellitus, Fukuoka University School of Medicine, Fukuoka, Japan
4. Muta Hospital, Fukuoka, Japan
5. Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
6. Department of Endocrinology, Metabolism, Rheumatology and Nephrology, Faculty of Medicine, Oita University, Yufu, Japan
7. Department of Metabolism and Endocrinology, Hamamatsu-Kita Hospital, Hamamatsu, Japan
8. Department of Endocrinology, Metabolism and Hypertension, National Hospital, Organization Kyoto Medical Center, Kyoto, Japan
9. Aska Pharma Medical Co. Ltd., Fujisawa, Japan
10. Japan Reference Measurement Institute, Tsukuba, Japan