1. Department of Medical Science, Chungnam National University, Daejeon, Republic of Korea;
2. Department of Otolaryngology-Head and Neck Surgery, Chungnam National University, Daejeon, Republic of Korea;
3. Department of Radiology, Chungnam National University, Daejeon, Republic of Korea;
4. Department of Otolaryngology-Head and Neck Surgery, Eulji University, Daejeon, Republic of Korea;
5. Brain Research Institute, College of Medicine, Chungnam National University, Daejeon, Republic of Korea