1. From the Department of Cardiology (M.S.C., D.-Y.K., J.-M.A., S.-J.P., D.-W.P., G.-B.N.) and the Division of Biostatics (S.-C.Y.), Asan Medical Center, University of Ulsan College of Medicine, the Department of Cardiology, Seoul St. Mary’s Hospital, College of Medicine, Catholic University of Korea (Y.-S.O.), the Department of Cardiology, Veterans Health Service Medical Center (C.H.L.), the Department of Internal Medicine, Seoul National University College of Medicine and Seoul National University...