1. From the Department of Medicine (Cardiovascular Division) (S.-C.L., S.-J.P., H.-K.K., H-C.G., W.R.L.), the Department of Neurology (C.-S.C.), the Department of Radiology (H.S.B.), and the Center for Health Promotion (K.-J.S., M.H.S.), College of Medicine, Sungkyunkwan University and Cardiac and Vascular Institute, Samsung Medical Center, Seoul, Korea.