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Li R, Mok E, Chang DT, Daly M, Loo BW Jr, Diehn M, Le QT, Koong A, Xing L.Li R, et al.Int J Radiat Oncol Biol Phys. 2012 Aug 1;83(5):e709-15. doi: 10.1016/j.ijrobp.2012.03.006. Epub 2012 May 2.Int J Radiat Oncol Biol Phys. 2012.PMID: 22554582Free PMC article.