1. Dun-Chang Mo, MD, Radiotherapy Department, The Third Affiliated Hospital of Guangxi Medical University, Nanning, China; Long Chen, MD, Otorhinolaryngology Department, The Third Affiliated Hospital of Guangxi Medical University, Nanning, China; Yu Wu, MD, Medical Department, The Third Affiliated Hospital of Guangxi Medical University, Nanning, China; and Jian-Feng Huang, MD and Xiu-Juan Liang, MD, Radiotherapy Department, The Third Affiliated Hospital of Guangxi Medical University, Nanning, China