1 Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York; Center for Health Policy and Outcomes, Memorial Sloan Kettering Cancer Center, New York, New York.
2 Radiation Medicine Program, Princess Margaret Cancer Centre, Toronto, Ontario, Canada; Department of Radiation Oncology, University of Toronto, Toronto, Ontario; Canada. Electronic address: danielle.rodin@rmp.uhn.ca.