1. Postgraduate Training Base of Jinzhou Medical University in the General Hospital of Northern Theater Command, Jinzhou, Liaoning, China
2. Department of Otolaryngology, General Hospital of Northern Theater Command, Shenyang, China
3. Outpatient Department of Fuxing Road, Jingnan Medical District, PLA General Hospital, Beijing, China
4. Department of Medical Information Center, General Hospital of Northern Theater Command, Shenyang, China