1. Department of Neurology, Haeundae Paik Hospital, Inje University, Busan, Korea.
2. Department of Neurology, Hanyang University Guri Hospital, Guri, Korea.
3. Department of Neurology, Kangwon National University Hospital, Kangwon National University College of Medicine, Chuncheon, Korea.
4. Department of Neurology, Hallym University Sacred Heart Hospital, Hallym Neurological Institute, College of Medicine, Hallym University, Anyang, Korea.
5. Department of Neurology, Veterans Health Service Medical Center, Seoul, Korea.
6. Department of Neurology, Korea University College of Medicine, Seoul, Korea.
7. Department of Neurology, College of Medicine, Gachon University Gil Medical Center, Incheon, Korea.