1. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Department of Neurology, Chung-Ang University Hospital, Seoul, Korea.
3. Department of Neurology, El Hospital, Namyangju, Korea.
4. Department of Neurology, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
5. Department of Neurology, Anyang SAM Hospital, Anyang, Korea.
6. Department of Physical Therapy, Yonsei University, Wonju, Korea.