1. Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
2. Department of Endocrinology, Metabolism, and Infectious diseases, Hirosaki University School of Medicine & Hospital, Hirosaki 036-8563, Japan
3. Family Medicine, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan