1. General Hospital of Northern Theater Command, Postgraduate Training Base of Jinzhou Medical University, 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