[1] Univ Lubeck, Inst Med Biometrie & Stat, Ratzeburgcr Allee 160, D-23562 Lubeck, Germany
[2] German Ctr Cardiovasc Res DZHK, Lubeck, Germany
[3] German Ctr Lung Res DZL, Airway Res Ctr North ARCN, Hannover, Germany
[4] Ludwig Maximilians Univ Munchen, Dr von Hauner Childrens Hosp, Munich, Germany
[5] German Ctr Lung Res DZL, Comprehens Pneumol Ctr Munich CPC M, Hannover, Germany
[6] Univ Bern, Univ Childrens Hosp Bern, Inselspital, Dept Paediat Resp Med, Bern, Switzerland
[7] Hannover Med Sch, Dept Paediat Pneumol Allergol & Neonatol, Hannover, Germany
[8] Biomed Res Endstage & Obstruct Lung Dis Hannover, Hannover, Germany
[9] German Ctr Lung Res DZL, Hannover, Germany
[10] Univ Lubeck, Dept Paediat Allergy & Pulmonol, Clin Paediat UKSH, Lubeck, Germany