Funding for this research was provided by:
Helse Sør-Øst RHF
Received: 11 December 2020
Accepted: 22 January 2021
First Online: 30 January 2021
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical and Health Research Ethics for South-East Norway and the Norwegian Medicines Agency. Written informed consent was obtained from all participants and from parents/next-of-kin if required.
: Not applicable.
: The authors declare that that they have no competing interests.