[1] Philipps Univ Marburg, Dept Pulm Med & Rehabil, Marburg, Germany
[2] German Ctr Lung Res, Marburg, Germany
[3] Chiesi GmbH Hamburg, Hamburg, Germany
[4] Copenhagen Univ Hosp Hvidovre, Dept Pulm Med, Hvidovre, Denmark
[5] Univ Oxford, Oxford, England
[6] Vienna Healthcare Grp, Karl Landsteiner Inst Clin & Expt Pneumol, Clin Hietzing, Vienna, Austria
[7] Pneumol Praxis Leipzig, Leipzig, Germany