Xuanzong Li1, Ruozheng Wang2, Linlin Wang3. 1. Department of Radiation Oncology, The Affiliated Tumor Hospital of Xinjiang Medical University, Urumqi, China; Department of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China. 2. Department of Radiation Oncology, The Affiliated Tumor Hospital of Xinjiang Medical University, Urumqi, China. 3. Department of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China. Electronic address: wanglinlinatjn@163.com.