1. Department of Neurology, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
2. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Neurology, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Neurology, Hallym University College of Medicine, Anyang, Korea.
5. Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Neurology, Ajou University School of Medicine, Suwon, Korea.
7. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.