[1] Harvard Radiat Oncol Program, Boston, MA USA
[2] Dana Farber Brigham & Womens Canc Ctr, Dept Radiat Oncol, Boston, MA USA
[3] Harvard Univ, Sch Med, Boston, MA USA
[4] Dana Farber Canc Inst, Dept Biostat & Computat Biol, Boston, MA 02115 USA
[5] Brigham & Womens Hosp, Dept Pathol, Boston, MA 02115 USA