1. Department of Otolaryngology, Liuzhou People’s Hospital of Guangxi, Liuzhou, Guangxi Zhuang Autonomous Region, P.R. China
2. Department of Radiotherapy, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, P.R. China
3. Department of Radiotherapy, Guangxi Medical University Cancer Hospital, Nanning, Guangxi Zhuang Autonomous Region, P.R. China
4. Department of Pathology, Liuzhou People’s Hospital, Liuzhou, Guangxi Zhuang Autonomous Region, P.R. China