[1] Univ Duisburg Essen, Childrens Univ Hosp Essen, Pediat Pulmonol & Sleep Med, Essen, Germany
[2] Mukoviszidose Inst gGmbH, Bonn, Germany
[3] Interdisciplinary Ctr Clin Trials MainzInst gGmbH, Mainz, Germany
[4] Justus Liebig Univ Giessen, Dept Pediat, Giessen, Germany
[5] Hannover Med Sch, Dept Resp Med, Hannover, Germany
[6] German Ctr Lung Res DZL, Biomed Res End Stage & Obstruct Lung Dis BREATH, Hannover, Germany