[1] Copenhagen Univ Hosp, Dept Paediat & Adolescent Med, Danish PCD & chILD Ctr, CF Ctr Copenhagen, Copenhagen, Denmark
[2] Aarhus Univ Hosp, Dept Paediat & Adolescent Med, CF Ctr Aarhus, Danish Ctr Paediat Pulmonol & Allergol, Aarhus, Denmark
[3] Childrens Hosp Westmead, Dept Resp Med, Sydney, NSW, Australia
[4] Univ Sydney, Discipline Paediat & Child Hlth, Sydney, NSW, Australia
[5] Woolcock Med Res Inst, Airway Physiol & Imaging Grp, Sydney, NSW, Australia
[6] Univ Gothenburg, Sahlgrenska Acad, Gothenburg, Sweden
[7] Skaraborg Hosp, Dept Children & Young Persons, Med Clin, Skovde, Sweden
[8] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark