1. From the Departments of Neurology (A.-H.C., J.S.K., S.U.K., E.-K.K., D.-W.K.), Radiology (S.-J.K., C.-G.C., D.-H.L., D.-C.S.), and Preventive Medicine (S.-C.Y.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea; and the Departments of Neurology (A.-H.C.) and Preventive Medicine (H.-R.K.), The Catholic University of Korea, St Mary’s Hospital, Seoul, Korea.