Funding for this research was provided by:
Norges Forskningsråd (256633)
Received: 25 August 2020
Accepted: 6 April 2021
First Online: 15 April 2021
: The study was approved by the Regional Committee for Medical and Health Research Ethics in South East Norway (No: 2016/2300). Written informed consent was obtained from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.