[1] Vassar Bros Med Ctr, Dept Surg, Poughkeepsie, NY USA
[2] Temple Univ, Sch Med, Dept Surg, Philadelphia, PA 19122 USA
[3] Fox Chase Canc Ctr, Dept Surg, Philadelphia, PA 19111 USA
[4] Fox Chase Canc Ctr, Dept Biostat, Philadelphia, PA 19111 USA
[5] Temple Univ, Sch Med, Dept Hlth Informat, Philadelphia, PA 19122 USA