Funding for this research was provided by:
Vetenskapsrådet (2016-01698, 2019-00989)
Hjärt-Lungfonden (20140321, 20170365)
The Cancer and Allergy Foundation
Forskningsrådet i Sydöstra Sverige (FORSS-666771)
Forskningsrådet i Sydöstra Sverige (FORSS-758981)
Received: 29 March 2021
Accepted: 15 June 2021
First Online: 30 June 2021
: Parents or legal guardians provided informed consent on behalf of the children prior to inclusion in the study. Ethical permission for this study has been granted by the Regional Ethics Committee for Human Research in Linköping (Dnr 2011/45-31).
: Not applicable.
: The authors declare that they have no competing interests.