1. Department of Radiation Oncology Sun Yat‐sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy Guangzhou P.R. China
2. Department of Radiation Oncology Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital Fuzhou China
3. Department of Radiotherapy Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences Guangdong Guangzhou P.R. China
4. Department of Radiation Oncology The Third Affiliated Hospital of Kunming Medical University (Yunnan Cancer Hospital, Yunnan Cancer Center) Kunming P.R. China
5. Department of Radiation Oncology, Hunan Cancer Hospital and The Affiliated Cancer Hospital 14 of Xiangya School of Medicine Central South University Changsha P.R. China
6. Department of Radiation Oncology Shunde Hospital of Southern Medical University Foshan P. R. China
7. Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology Maastricht University Medical Center Maastricht The Netherlands