1. Department of Neurology, Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, Korea
2. Department of Preventive Medicine, College of Medicine, Chung-Ang University, Seoul, Korea
3. Department of Neurosurgery, Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, Korea
4. Department of Clinical Laboratory Science, Dongnam Health University, Suwon, Korea