[1] Univ Hosp Leuven, Dept Thorac Surg, Herestr 49, B-3000 Leuven, Belgium
[2] Katholieke Univ Leuven, Dept Chron Dis & Metab, Leuven, Belgium
[3] Univ Hosp Leuven, Dept Radiotherapy, Leuven, Belgium
[4] Katholieke Univ Leuven, Dept Oncol, Leuven, Belgium
[5] Univ Hosp Leuven, Dept Gen Med Oncol, Leuven, Belgium