1. From the Center for Cohort Studies, Total Healthcare Center (S.K., Y.C., J.C., J.K., H.-S.J., K.E.Y., S.R., H.S.), Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
2. Department of Occupational and Environmental Medicine (Y.C., S.R.), Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
3. Department of Clinical Research Design & Evaluation, SAIHST, Sungkyunkwan University, Seoul, Korea (Y.C., J.C., E.G., S.R.)
4. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (J.C., Y.S.H., D.Z., E.G.).
5. Department of Family Medicine (H.S.), Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea