[1] Natl Univ Singapore Hosp, Natl Univ Canc Inst, Dept Radiat Oncol, Singapore 119228, Singapore
[2] Tuen Mun Hosp, Hosp Author, Dept Clin Oncol, New Terr West Cluster, Hong Kong, Peoples R China
[3] Princess Margaret Hosp, Dept Oncol, Kwai Chung, Hong Kong, Peoples R China
[4] Inst Canc Res, Canc Risk Factors & Lifestyle Epidemiol Unit, Prevent & Clin Network ISPO, Florence, Italy
[5] Univ Toronto, Odette Canc Ctr, Sunnybrook Hlth Sci Ctr, Toronto, ON, Canada
[6] Univ Lubeck, Dept Radiat Oncol, Lubeck, Germany
[7] Flinders Univ S Australia, Caring Futures Inst, Coll Nursing & Hlth Sci, Adelaide, Australia
[8] Univ Rochester, Dept Dermatol & Radiat Oncol, Med Ctr, Rochester, NY USA
[9] Netherlands Comprehens Canc Org, Res & Dev Dept, Utrecht, Netherlands
[10] McMaster Univ, Michael G DeGroote Sch Med, Hamilton, ON, Canada
[11] Univ Florence, Azienda Osped Univ Careggi, Radiat Oncol, Florence, Italy
[12] Univ Otago, Dept Radiat Therapy, Wellington, New Zealand