1 Department of Oncology, Division of Radiation Oncology, McGill University Health Centre, McGill University, Montreal, Canada. Electronic address: fabio.cury@mcgill.ca.
2 Ribeirao Preto Medical School, Department of Medical Imagings, Hematology and Oncology of University of São Paulo (FMRP-USP), Ribeirão Preto, Brazil.
3 Department of Oncology - Division of Radiation Oncology, Juravinski Cancer Centre, McMaster University, Hamilton, ON, Canada.
4 Department of Oncology, Division of Radiation Oncology, Kingston General Hospital, Queen's University, Kingston, Canada.