1 Department of Radiation Oncology, Center for Advanced Medicine, Washington University School of Medicine, 4921 Parkview Place, Lower Level, St. Louis, MO, 63110, USA. justinbarnes@wustl.edu.
2 Department of Radiation Oncology, Duke University Medical Center, Durham, NC, USA.
3 Duke Cancer Institute, Durham, NC, USA.
4 Department of Radiation Oncology, Affordability Working Group, Memorial Sloan Kettering Cancer Center, New York, NY, USA.