1. Clinical Research Institute, Division of Endocrinology and Metabolism, National Hospital Organization Kyoto Medical Center, Japan
2. Department of Endocrinology and Metabolism, National Hospital Organization Nagoya Medical Center, Japan
3. Department of Internal Medicine, National Hospital Organization Mie Chuou Medical Center, Japan
4. Department of Metabolism and Endocrinology, National Hospital Organization Kyushu Medical Center, Japan
5. Department of General Medicine, National Hospital Organization Sendai Medical Center, Japan
6. Department of Diabetes and Endocrinology, National Hospital Organization Kumamoto Medical Center, Japan
7. Division of Internal Medicine, National Hospital Organization Kokura Medical Center, Japan