[1] Royal Brompton Hosp, Acad Div Thorac Surg, London SW3 6NP, England
[2] Univ London Imperial Coll Sci Technol & Med, London, England
[3] Harefield Hosp, Dept Radiol, London, England
[4] Univ Libre Bruxelles, Dept Radiat Oncol, Inst Bordet, Brussels, Belgium
[5] CHU Vaudois, Dept Med Oncol, CH-1011 Lausanne, Switzerland
[6] Swedish Canc Inst, Dept Thorac Surg, Seattle, WA USA