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