[1] Univ Hosp Cologne, Dept Internal Med 1, Lung Canc Grp Cologne, Cologne, Germany
[2] Univ Hosp Cologne, Cologne, Germany
[3] Univ Hosp Cologne, Inst Pathol, Cologne, Germany
[4] Lungenklin Hemer, Hemer, Germany
[5] Johanniter Hosp, Evangel Clin Bonn, Bonn, Germany
[6] Malteser Hosp Bonn Rhein Sieg, Thorac Ctr, Bonn, Germany
[7] Neo New Oncol, Cologne, Germany