1. Department of Neurology, Pusan National University Hospital, Pusan National University School of Medicine and Medical Research Institute, Busan, Korea.
2. Department of Neurology, Pusan New Hongje Hospital, Busan, Korea.
3. Department of Neurology, Seoul National University Hospital, Seoul, Korea.
4. Department of Anesthesiology, Pusan National University Hospital, Pusan National University School of Medicine and Medical Research Institute, Busan, Korea.