1. School of Medicine and Public Health, University of Newcastle, Callaghan, New South Wales, NSW, Australia
2. Département de Radiothérapie, Institut de Cancérologie de l'Ouest, Saint-Herblain, France
3. Radiation Physics Laboratory, Sydney Medical School, University of Sydney, Sydney, New South Wales, NSW, Australia
4. Radiation Medicine Program, Princess Margaret Hospital, University of Toronto, Toronto, ON, Canada