[1] Univ Coll London Hosp, NHS Trust, London NW1 2PG, England
[2] UCL Canc Inst, London, England
[3] Univ Coll Hosp, Dept Oncol, London, England
[4] Netherlands Canc Inst, Dept Thorac Oncol, Amsterdam, Netherlands
[5] Stanford Univ, Dept Med, Stanford Canc Ctr, Div Oncol, Stanford, CA 94305 USA