1. From the Department of Radiation Oncology (E.L.P., B.Y.D., M.G., D.A.M., A.C.K., D.T.C.), Centers for Health Policy and Primary Care and Outcomes Research (K.L., D.K.O., J.G.F.), and Department of Radiology (N.K.), Stanford University School of Medicine, Stanford University Medical Center, 875 Blake Wilbur Dr, Stanford, CA 94305-5847; Department of Radiation Oncology, University of Michigan Medical School, Ann...