[1] Schoen Klin Berchtesgadener Land, Dept Resp Med, Schonau Am Konigssee, Germany
[2] TUM, Dept Prevent Rehabil & Sports Med, Klinikum Rechts Isar, Munich, Germany
[3] Univ Munich, Dept Internal Med 5, Munich, Germany
[4] Comprehens Pneumol Ctr Munich, Asklepios Clin Munchen Gauting, Munich, Germany
[5] Hannover Med Sch, Dept Resp Med, Hannover, Germany
[6] Heidelberg Univ, Ctr Interstitial & Rare Lung Dis, Pneumol & Resp Crit Care Med, Thoraxklin, Heidelberg, Germany
[7] TLRCH, Heidelberg, Germany
[8] Univ Marburg, Dept Pulm Rehabil, Marburg, Germany