Funding for this research was provided by:
Received: 19 February 2021
Accepted: 20 May 2021
First Online: 28 June 2021
: Written informed consent was obtained from the patients and/or their legal guardians. The study protocol was approved by the local ethics committee (H-7-2014-016) and the Danish Data Protection Agency.
: Not applicable
: The authors declare that they have no competing interests.