1. Department of Internal Medicine (Y.H., K.F., K.S., S.K., H.S.), Niigata University Faculty of Medicine, Niigata 951–8510, Japan
2. Health Management Center (Y.H., Y.A., H.T., K.S., S.D.H., S.K., S.H., H.S.), Tokyo 105–8470, Japan
3. Okinaka Memorial Institute for Medical Research (Y.A., H.T., S.D.H., S.H.), Toranomon Hospital, Tokyo 105–8470, Japan
4. Ibaraki Prefectural University of Health Sciences Hospital (K.S.), Ibaraki 300-0394, Japan
5. Department of Pharmacoepidemiology (S.T.), Graduate School of Medicine and Public Health, Kyoto University, Kyoto 606-8501, Japan