1. Postgraduate Training Base of Jinzhou Medical University (The PLA Rocket Force Characteristic Medical Center) Beijing P. R. China
2. Department of Otolaryngology The PLA Rocket Force Characteristic Medical Center Beijing P. R. China
3. College of Otolaryngology Head and Neck Surgery Chinese PLA General Hospital, Chinese PLA Medical School Beijing P. R. China
4. National Clinical Research Center for Otolaryngologic Diseases State Key Lab of Hearing Science, Ministry of Education Beijing P. R. China
5. Beijing Key Lab of Hearing Impairment Prevention and Treatment Beijing P. R. China