1 Department of Otorhinolaryngology, Zhifu Branch of Yantai Yuhuangding Hospital, Yantai 264000, China.
2 Department of Otorhinolaryngology, Penglai people's Hospital, Penglai 264300, China.
3 Department of Otorhinolaryngology, Yantai Yuhuangding Hospital, Yantai 264000, China.
4 Department of Otorhinolaryngology, Zhifu Branch of Yantai Yuhuangding Hospital, Yantai 264000, China; Department of Otorhinolaryngology, Yantai Yuhuangding Hospital, Yantai 264000, China.