1. Department of Neurology, Seoul National University Hospital, Seoul, Republic of Korea
2. Department of Neurology, Korea University Guro Hospital, Seoul, Republic of Korea
3. Department of Neurology, Kangdong Sacred Heart Hospital, Hallym University Medical Center, Seoul, Republic of Korea
4. Department of Neurology and Neurosurgery, The Mischer Neuroscience Institute, Memorial Hermann of Texas Medical Center, Houston, Texas