[1] Univ Vermont, Larner Coll Med, Div Radiat Oncol, Burlington, VT USA
[2] Univ Vermont, Larner Coll Med, Div Hematol & Oncol, Burlington, VT USA
[3] Yale Sch Med, Dept Therapeut Radiol, New Haven, CT USA
[4] Univ Vermont, Dept Med, Larner Coll Med, Burlington, VT USA
[5] Univ Vermont, Dept Surg, Larner Coll Med, Burlington, VT 05405 USA