1. Medical School of Chinese PLA, Beijing, China
2. College of Otolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing, China
3. The First Medical Center, Chinese PLA General Hospital, Beijing, China
4. National Clinical Research Center for Otolaryngologic Diseases, Beijing, China
5. Department of Neurosurgery, The Second Naval Hospital of Southern Theater Command of PLA, Sanya, China
6. Department of Otolaryngology, General Hospital of Xinjiang Military Region of the Chinese PLA, Urumqi, China