[1] Uniklin Koln, Lung Canc Grp Cologne, Cologne, Germany
[2] Uniklin Koln, Inst Pathol, Cologne, Germany
[3] Lungenklinik, Hemer, Germany
[4] Johanniter Krankenhaus, Bonn, Germany
[5] Malteser Krankenhaus Bonn, Bonn, Germany
[6] Schwerpunktpraxis Lungen & Bronchialheilkund, Dusseldorf, Germany
[7] Uniklin Koln, Innere Med Klin 1, Cologne, Germany