[1] Thomas Jefferson Univ, Philadelphia, PA 19107 USA
[2] Univ Texas Austin, Dept Biomed Engn, Austin, TX 78712 USA
[3] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Radiat Oncol, Philadelphia, PA 19107 USA
[4] MIM Software Inc, Beachwood, OH USA
[5] Emory Univ, Dept Radiat Oncol, Winship Canc Inst, Atlanta, GA 30322 USA
[6] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA