From the Department of Cardiology (S.-J.P., Y.-H.K., D.-W.P., S.-W.L., W.-J.K., J.S., C.W.L., M.-K.H., S.-W.P.), Asan Medical Center, University of Ulsan College of Medicine; Seoul, Korea; Division of Biostatistics (S.-C.Y.), Center for Medical Research and Information, University of Ulsan College of Medicine, Seoul, Korea; and Department of Cardiology (J.-H.L.), Chungnam National University Hospital, Daejeon, Korea. (At 2009-06)
