1. From the Department of Preventive Medicine (H.L., H.C.K.), Yonsei University College of Medicine, Seoul, Korea
2. Department of Internal Medicine (H.L., S.P., H.C.K.), Yonsei University College of Medicine, Seoul, Korea
3. Department of Community and Family Medicine, Duke University, Durham, NC (Y.Y.)
4. Department of Public Health, Yonsei University Graduate School, Seoul, Korea (S.M.J.C.)
5. Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute (S.P.), Yonsei University College of Medicine, Seoul, Korea
6. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL (D.M.L.-J.).