1. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Department of Neurology, Inje University Ilsan Paik Hospital, Goyang, Korea.
3. Department of Neurology, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
4. Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
5. Department of Neurology, Soonchunhyang University Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
6. Department of Neurology, Eulji University Hospital, Eulji University College of Medicine, Daejeon, Korea.
7. Department of Neurosurgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
8. Clinical Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea.
9. Department of Biostatistics, Korea University College of Medicine, Seoul, Korea.
10. Health Insurance Review and Assessment Service, Wonju, Korea.