1. Department of Endocrinology and Metabolism, Graduate School of Medicine, Yokohama City University, Yokohama 236-0004, Japan
2. Department of Endocrinology and Metabolism, Chigasaki Municipal Hospital, Chigasaki 253-0042, Japan
3. Department of Endocrinology and Diabetes, Saiseikai Yokohama City South Hospital, Yokohama 234-0054, Japan