1. Department of Neurology, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
2. Busan-Ulsan Regional Cerebrovascular Center and Department of Neurology; Dong-A University College of Medicine; Busan South Korea
3. Department of Cardiovascular Surgery, Asan Medical Center; University of Ulsan College of Medicine; Seoul South Korea
4. Department of Neurology and Neurotherapeutics; Seton/University of Texas Southwestern Clinical Research Institute; Austin TX