1 Princess Margaret Cancer Centre, Department of Radiation Oncology, University of Toronto, Toronto, ON, M5G 2M9, Canada.
2 Department of Surgery, University of Washington, Seattle, WA, USA.
3 University Institute of Pathology, Lausanne University Medical Center, Lausanne, Switzerland.
4 Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, UK.
5 Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD, USA.
6 Cancer Surveillance Section, International Agency for Research on Cancer, Lyon, France.
7 Belgium Cancer Registry, Brussels, Belgium.
8 Division of Cancer Prevention and Control, Centers for Disease Control and Prevention, Atlanta, GA, USA.
9 Princess Margaret Cancer Centre, Department of Radiation Oncology, University of Toronto, Toronto, ON, M5G 2M9, Canada. Electronic address: marykg@rmp.uhn.on.ca.