Funding for this research was provided by:
Uppsala-Örebro Regional Research Council
Received: 5 November 2020
Accepted: 14 April 2021
First Online: 26 April 2021
: The study was approved by the local ethics committee in Uppsala County, Sweden (Dnr 2006/327, 2006/327/1, 2006/327/3 for the participants with JIA and 2014/335 for the controls) and was conducted in accordance with the Declaration of Helsinki. Informed consent was obtained from participating children and parents, and written informed consent was obtained from all parents.
: Not applicable; no individual data displayed.
: The authors declare that they have no competing interests.