1 Precision Radiotherapeutics Oncology Programme, Division of Medical Sciences, National Cancer Centre Singapore, 30 Hospital Boulevard, Singapore, 168583, Singapore.
2 Radiation Oncology Center, Chongqing University Cancer Hospital, Chongqing, China.
3 Precision Radiotherapeutics Oncology Programme, Division of Medical Sciences, National Cancer Centre Singapore, 30 Hospital Boulevard, Singapore, 168583, Singapore. melvin.chua.l.k@singhealth.com.sg.
4 Department of Head and Neck and Thoracic Radiation Oncology, National Cancer Centre Singapore, 30 Hospital Boulevard, Singapore, 168583, Singapore. melvin.chua.l.k@singhealth.com.sg.