1. Endocrinology and Diabetes Center, Yokohama Rosai Hospital, Yokohama, Japan.
2. Department of Diabetes, Endocrinology, and Metabolism, Center Hospital, National Center for Global Health and Medicine, Tokyo, Japan.
3. Department of Clinical Study and Informatics, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan.
4. Department of Public Health/Health Policy, The University of Tokyo, Tokyo, Japan.