1. Department of Public Health, Tokyo Women's Medical University, Tokyo, Japan
2. Department of Diabetes Research, Diabetes Research Center, National Center for Global Health and Medicine, Tokyo, Japan
3. Department of Endocrinology and Metabolism, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
4. Department of Endocrinology and Diabetes, Saitama Medical University, Saitama, Japan