1. From the Department of Radiation Oncology, Columbia University Irving Medical Center, 622 W 168th St, New York, NY 10032 (E.L., M.D.G., Y.F.W., C.C., C.E., M.S., M.P., L.A.K., D.P.H.); and Herbert Irving Comprehensive Cancer Center, New York, NY (C.C., L.A.K., D.P.H.).