[1] Geisel Sch Med Dartmouth, Hanover, NH USA
[2] Harvard Med Sch, Dana Farber Canc Inst, Dept Biostat & Computat Biol, Boston, MA 02115 USA
[3] Brigham & Womens Hosp, Dana Farber Canc Inst, 75 Francis St, Boston, MA 02115 USA
[4] Brigham & Womens Hosp, Dana Farber Canc Inst, Dept Radiat Oncol, 75 Francis St, Boston, MA 02115 USA
[5] Univ Calif San Francisco, Boston, MA USA
[6] Harvard Med Sch, Boston, MA 02115 USA