1. Department of Endocrinology and Diabetes, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
2. Department of Endocrinology and Metabolism, Fujita Health University School of Medicine, Toyoake 470-1192, Japan
3. Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
4. Department of Family and Community Medicine, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan
5. The First Department of Medicine, Wakayama Medical University, Wakayama 641-8509, Japan