Funding for this research was provided by:
Sahlgrenska Akademin (ALFGBG-813221)
The Swedish Asthma and Allergy Association Research Foundation (F20160006)
Received: 25 February 2020
Accepted: 20 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: Written informed consent for participation in this study was obtained from the guardians of the children. The study was approved by the Human Research Ethics Committee of the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden (Dnr 105–07).
: Not applicable.
: The authors declare that they have no competing interests.