1. Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine and Hospital, Hirosaki, Aomori, Japan
2. Second Division, Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
3. Department of Family and Community Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan