[1] Univ Lubeck, Univ Med Ctr Schleswig Holstein, Dept Paediat Pneumol & Allergol, Lubeck, Germany
[2] Univ Med Ctr Schleswig Holstein, Univ Childrens Hosp, Lubeck, Germany
[3] German Ctr Lung Res DZL, Airway Res Ctr North ARCN, Lubeck, Germany
[4] Univ Bern, Bern Univ Hosp, Dept Paediat Resp Med, Inselspital, Bern, Switzerland
[5] Leibniz Lung Res Ctr Borstel, Div Epigenet Chron Lung Dis, Prior Res Area Chron Lung Dis, Borstel, Germany
[6] Univ Bern, Univ Hosp Bern, Div Paediat Resp Med & Allergol, Inselspital, Bern, Switzerland