1. The 2nd Medical College of Binzhou Medical University, Yantai, China
2. Department of Otorhinolaryngology, Head and Neck Surgery, Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
3. Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China
4. Department of Pathology, Yantai Yuhuangding Hospital, Qingdao University, Yantai, China
5. Yaitai Key Laboratory of Otorhinolaryngologic Diseases, Yantai, China