1 Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina; Radiation Oncology Service, Durham VA Health Care System, Durham, North Carolina. Electronic address: jeremy.price@tuhs.temple.edu.
2 Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina; Radiation Oncology Service, Durham VA Health Care System, Durham, North Carolina.
3 Department of Radiation Oncology, Loyola University Chicago, Maywood, Illinois; Radiation Oncology Service, Edward Hines Jr, VA Hospital, Hines, Illinois.
4 Department of Radiation Oncology, Emory University, Atlanta, Georgia.