1. Department of Endocrinology and Diabetes, Saitama Medical University Hospital, Saitama 350-0495, Japan
2. Caress Sapporo Hokko Memorial Clinic, Hokkaido 065-0027, Japan
3. Department of Endocrinology, Tenri Hospital, Nara 632-8552, Japan
4. Department of Endocrinology and Diabetes, Japanese Red Cross Ogawa Hospital, Saitama 355-0397, Japan
5. Department of Medicine, Division of Endocrinology and Metabolism, Jichi Medical University Saitama Medical Center, Saitama 330-8503, Japan
6. Department of Medicine II, Kansai Medical University, Osaka 573-1191, Japan
7. Department of Endocrinology, Metabolism and Hypertension Research, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, Kyoto 612-8555, Japan
8. Division of Diabetes and Endocrinology, Japanese Red Cross Omori Hospital, Tokyo 143-8527, Japan
9. Department of General Internal Medicine, Saitama Medical University Hospital, Saitama 350-0495, Japan
10. Department of Diabetes, Metabolism and Endocrinology, Ichikawa Hospital, International University of Health and Welfare, Chiba 272-0827, Japan