1. From the Department of Neurology (K.-W.N., H.-Y.J.), Seoul National University College of Medicine, Seoul National University Hospital, Korea
2. Department of Neurology, Seoul National University College of Medicine and Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Korea (H.-M.K.).
3. Department of Family Medicine (J.-H.P., H.K., S.-M.J.), Seoul National University College of Medicine, Seoul National University Hospital, Korea