1. Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Neurology, Seoul National University College of Medicine, Clinical Neuroscience Center, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.