1. Department of Neurology, Daejeon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Dajeon, Korea.
2. Department of Radiology, Daejeon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Dajeon, Korea.
3. Department of Neurology, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
4. Department of Neurology, Incheon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Incheon, Korea.
5. Department of Neurology, Chungnam National University Hospital, Daejeon, Korea.