Shihai Wu1, Rencui Quan2, Ling Han3. 1. Department of Radiation Oncology, Second Clinical Medicine College of Jinan University, Shenzhen People's Hospital, China. Electronic address: Jiangxiwu84@126.com. 2. Department of Radiation Oncology, Second Clinical Medicine College of Jinan University, Shenzhen People's Hospital, China. 3. Department of Otorhinolaryngology, Second Clinical Medicine College of Jinan University, Shenzhen People's Hospital, China.