Affiliations:
1 Second Clinical Medicine College, Binzhou Medical University, Yantai, Shandong 264003, People’s Republic of China
2 Department of Otorhinolaryngology, Head and Neck Surgery, Yantai Yuhuangding Hospital, Qingdao University, Yantai, Shandong 264000, People’s Republic of China
3 Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, Shandong 264000, People’s Republic of China
4 School of Clinical Medicine, Weifang Medical University, Weifang, 261042, China.