[1] Antoni Van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Radiat Oncol, Amsterdam, Netherlands
[2] Antoni Van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Thorax Oncol, Amsterdam, Netherlands
[3] Vrije Univ Amsterdam, Med Ctr, Dept Radiat Oncol, Amsterdam, Netherlands