1. Department of Neurology, Uijeongbu Eulji Medical Center, Eulji University School of Medicine, Uijeongbu, Korea.
2. Department of Neurology, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.
3. Department of Neurology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Neurology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Neurology, St Vincent’s Hospital, The Catholic University of Korea, Suwon, Korea.
7. Department of Statistics, Hallym University, Chuncheon, Korea.
8. Department of Neurology, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
9. Department of Neurology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.