1 Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Radiation Oncology, University of Toronto, Toronto, Canada. Electronic address: kathy.han@rmp.uhn.ca.
2 Department of Radiation Oncology, London Health Sciences Centre, Western University, Canada.
3 Sunnybrook Health Sciences Centre, Toronto, Canada; Department of Radiation Oncology, University of Toronto, Toronto, Canada.
4 Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Radiation Oncology, University of Toronto, Toronto, Canada.
5 Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Toronto, Canada.