1. School of Public Health, University of California, Berkeley Berkeley California USA
2. Department of Diabetes, Metabolism and EndocrinologyTokyo Metropolitan Geriatric Medical Center Tokyo Japan
3. Department of Community‐Based Medical System, Graduate School of Biomedical and Health SciencesHiroshima University Hiroshima Japan
4. Division of Endocrinology and Metabolism, Department of Internal MedicineJichi Medical University Tochigi Japan