Funding for this research was provided by:
Nederlandse Vereniging voor Kinderreumatologie
Received: 14 August 2020
Accepted: 23 March 2021
First Online: 7 April 2021
: The Medical Ethical Committee of University Medical Centre Utrecht confirmed that this study was exempted from the Medical Research Involving Humans Act (WMO) (METC protocol number 18–721/C).
: Not applicable.
: The authors declare no competing interests.