1. The 2nd Medical College of Binzhou Medical University, Yantai 264000, Shandong, China
2. Department of Otorhinolaryngology and Head and Neck Surgery, Yuhuangding Hospital Affiliated to Qingdao University, Yantai 264000, Shandong, China
3. Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai 264000, Shandong, China
4. Weifang Medical University, Weifang, Shandong, China