1. Department of Rehabilitation Medicine, Kangwon National University School of Medicine, Kangwon National University Hospital, Chuncheon, Korea.
2. Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
4. Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.