1. Department of Neurology, Seoul National University Hospital, Seoul, Korea.
2. Department of Neurology, Konkuk University School of Medicine, Seoul, Korea.
3. Department of Neurology, Soonchunhyang University College of Medicine, Cheonan Hospital, Cheonan, Korea.
4. Department of Neurology, Kyunghee University Hospital at Gangdong, Seoul, Korea.
5. Department of Neurology, School of Medicine, Kyungpook National University, Daegu, Korea.
6. Department of Neurology, Samsung Noble County, Yongin, Korea.
7. Department of Neurology, Chonnam National University Hospital, Chonnam National University School of Medicine, Gwangju, Korea.
8. Department of Neurology, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.
9. Department of Neurology, Keimyung University Dongsan Medical Center, Daegu, Korea.