1. Cheeloo College of Medicine, Shandong University, Jinan, China.
2. Shandong Provincial Key Laboratory of Radiation Oncology, Cancer Research Center, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Sciences, Jinan, China.
3. School of Public Health, Qingdao University, Qingdao, China.
4. Cancer Center, The First Affiliated Hospital of Jilin University, Changchun, China.