1. Department of Neurology, Bobath Memorial Hospital, Seongnam, Korea.
2. Department of Neurology, Hallym University Sacred Heart Hospital, Anyang, Korea.
3. Department of Neurology, Kangwon National University Hospital, Chuncheon, Korea.
4. Department of Neurology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Neurology, Gangnam-gu Haengbok Convalescence Hospital, Seoul, Korea.
6. Department of Neurology, Incheon Sarang General Hospital, Incheon, Korea.