1. Department of Neurology, Asan Medical Center (H.-J.J., B.J.K., D.-W.K, S.U.K., J.Y.C.)
2. Department of Neurology, Korea University Ansan Hospital, Korea University College of Medicine, South Korea (J.-C.R.).
3. University of Ulsan College of Medicine, Seoul, South Korea (B.J.K., D.-W.K., S.U.K., J.Y.C.).
4. Department of Neurology, Gangneung Asan Hospital (J.S.K.)