1. Department of Neurology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
2. Department of Cardiology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
3. Department of Neurology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
4. Department of Neurology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
5. Department of Neurology, Mokdong Hospital, Ewha Womans University, College of Medicine, Seoul, Korea.
6. Department of Neurology, Eunpyeong St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
7. Department of Neurology, Kyung Hee University College of Medicine, Seoul, Korea.
8. Department of Neurology, Chung-Ang University College of Medicine, Chung-Ang University Hospital, Seoul, Korea.
9. Department of Neurology, Myongji Hospital, Hanyang University College of Medicine, Goyang, Korea.
10. Department of Neurology, Jeju National University, Jeju, Korea.
11. Department of Neurology, Chonnam National University Hospital, Gwangju, Korea.
12. Department of Neurology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
13. Department of Neurology, School of Medicine, Kyungpook National University, Daegu, Korea.
14. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.