Fang P, He W, Gomez DR, Hoffman KE, Smith BD, Giordano SH, Jagsi R, Smith GL. Int J Radiat Oncol Biol Phys. 2017 Feb 1. pii: S0360-3016(17)30291-2. doi: 10.1016/j.ijrobp.2017.01.228. [Epub ahead of print]