1. Department of Medical Science, Chungnam National University School of Medicine, Daejeon 35015, Korea
2. Department of Anatomy, Brain Research Institute, Chungnam National University School of Medicine, Daejeon 35015, Korea
3. Department of Anesthesia and Pain Medicine, Chungnam National University Hospital, Daejeon 35015, Korea
4. Department of Neurology, Chungnam National University Hospital, Daejeon 35015, Korea