1. Department of Otorhinolaryngology-Head and Neck Surgery, Dong-A University College of Medicine, Busan, Korea.
2. Department of Radiology, Dong-A University College of Medicine, Busan, Korea.
3. Department of Neurology, Dong-A University College of Medicine, Busan, Korea.
4. Department of Neurosurgery, Dong-A University College of Medicine, Busan, Korea.
5. Department of Oral and Maxillofacial Surgery, Dong-A University College of Medicine, Busan, Korea.
6. Department of Otorhinolaryngology-Head and Neck Surgery, St. Mary's Medical Center, Busan, Korea.