1 Department of Breast Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas. Electronic address: sfshaitelman@mdanderson.org.
2 Department of Radiation Oncology, Kaiser Permanent, Seattle, Washington.
3 Radiation Oncology Branch, National Cancer Institute, Bethesda, Maryland.
4 Department of Radiation Oncology, University Hospitals Seidman Cancer Center, Cleveland, Ohio.