1 Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
2 College of Medicine, University of the Philippines, Manila, Philippines.
3 Department of Head and Neck and Thoracic Cancers, National Cancer Centre Singapore, Divisions of Radiation Oncology and Medical Sciences, Singapore.
4 Oncology Academic Programme, Duke-NUS Medical School, Singapore.
5 Cancer Surveillance Branch, International Agency for Research on Cancer, Lyon, France.
6 Department of Social and Preventive Medicine, Faculty of Medicine, Centre for Epidemiology and Evidence-Based Practice, University of Malaya, Kuala Lumpur, Malaysia.