1. Department of Neurology, College of Medicine, Kyung Hee University, Seoul, Korea.
2. Department of Neurology, Seoul Bukbu Hospital, Seoul, Korea.
3. Department of Thoracic and Cardiovascular Surgery, College of Medicine, Kyung Hee University, Seoul, Korea.
4. Department of Radiology, College of Medicine, Kyung Hee University, Seoul, Korea.
5. Clinical Research Center, Asan Medical Center, Seoul, Korea.
6. Department of Neurology, College of Medicine, Hanyang University, Seoul, Korea.