1. Department of Otorhinolaryngology–Head and Neck SurgeryWest China Hospital, West China School of Medicine, Sichuan University Chengdu Sichuan PR China
2. Department of Otorhinolaryngology–Head and Neck SurgeryAffiliated Hospital of North Sichuan Medical College Nanchong Sichuan PR China
3. Department of Otorhinolaryngology–Head and Neck SurgeryNanchong Central Hospital Nanchong Sichuan PR China
4. Department of General PracticeAffiliated Hospital of North Sichuan Medical College Nanchong Sichuan PR China