[1] Cleveland Clin, Taussig Canc Inst, Dept Radiat Oncol, Cleveland, OH 44106 USA
[2] Case Western Reserve Univ, Sch Med, Cleveland, OH USA
[3] Harvard Med Sch, Massachusetts Gen Hosp, Dept Radiat Oncol, Boston, MA 02115 USA
[4] Massachusetts Gen Hosp, Boston, MA 02114 USA
[5] Washington Univ, Sch Med, St Louis, MO USA
[6] Univ Miami, Miami, FL USA
[7] Univ Michigan, Dept Radiat Oncol, Rogel Canc Ctr, Michigan Med, Ann Arbor, MI 48109 USA
[8] Univ Michigan, Dept Radiat Oncol, Ann Arbor, MI 48109 USA