Affiliation: | 1. Department of Growth and Reproduction, Rigshospitalet, University Hospital of Copenhagen, , Copenhagen, Denmark;2. Asthma and Allergy Clinic, Children's Clinic Randers, , Randers, Denmark;3. Department of Paediatrics, Aarhus University Hospital, , Aarhus, Denmark;4. Section of Biostatistics, Department of Public Health, University of Copenhagen, , Copenhagen, Denmark |