Funding for this research was provided by:
Arvid Nilssons Fond
Gigtforeningen (R141 A4002; R128 A3394; R91 A1652)
Received: 14 August 2020
Accepted: 23 March 2021
First Online: 1 April 2021
: The study was conducted in accordance with the declaration of Helsinki. All participating families provided written informed consent prior to enrolment and the Central Denmark Region’s research ethics committee approved the study (M-20110160). The study was observational and registered on ExternalRef removed (ExternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.