Perks JR, Stanic S, Stern RL, Henk B, Nelson MS, Harse RD, Mathai M, Purdy JA, Valicenti RK, Siefkin AD, Chen AM. Failure mode and effect analysis for delivery of lung stereotactic body radiation therapy. Int J Radiat Oncol Biol Phys. 2012 Jul 15; 83(4):1324-9.