[1] Hosp Gen Alicante, Alicante, Spain
[2] Hosp Cruces Barakaldo, Vizcaya, Spain
[3] Univ Hosp Bern, Dept Clin Res, Lab Thorac Surg, Bern, Switzerland
[4] Univ Zurich Hosp, Clin & Policlin Oncol, Zurich, Switzerland
[5] Catalan Inst Oncol, Barcelona, Spain
[6] Hosp 12 Octubre, Madrid, Spain
[7] Complejo Hosp A Coruna, La Coruna, Spain
[8] MD Anderson Canc Ctr, Madrid, Spain
[9] Hosp Univ Miguel Servet, Zaragoza, Spain
[10] Hosp Son Llatzer, Palma de Mallorca, Spain
[11] Univ Alcala de Henares, E-28801 Alcala De Henares, Spain
[12] Univ Antwerp Hosp, Antwerp, Belgium