[1] Klinikum Reg Hannover, Krankenhaus Oststadt Heidehaus, Abt Pneumol & Internist Intens Med, Podbielskistr 380, D-30659 Hannover, Germany
[2] Univ Klinikum Heidelberg, Thoraxklin, Abt Pneumol Innere Med, Heidelberg, Germany
[3] Univ Klin Freiburg, Abt Pneumol, Freiburg, Germany