1. Department of Radiation Oncology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center of Cancer Medicine, Guangzhou, Guangdong, China
2. Department of Radiation Oncology, Stanford University, Stanford, California
3. Division of Radiation Oncology, National Cancer Centre Singapore, Singapore
4. Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, New York
5. Department of Radiation Oncology, University of Toronto, Princess Margaret Cancer Center, Toronto, Ontario, Canada
6. Department of Clinical Oncology, The University of Hong Kong and The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China