1. Department of Veterinary Medicine, Southwest University, Chongqing, China;
2. Department of Laboratory Animal Science, College of Basal Medical Science, Third Military Medical University, Shapingba, Chongqing, China;
3. Department of Otorhinolaryngology Head and neck surgery, The First Hospital of Jilin University, Changchun, Jilin, P.R. China;
4. Department of Otolaryngology, Head and Neck Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China