Received: 27 September 2021
Accepted: 31 December 2021
First Online: 18 January 2022
: The study was approved by the Regional Committee for Medical and Health Research Ethics (REK Sørøst B 2015/2169), and followed the principles of the Declaration of Helsinki. Participation was voluntary and based on written informed consent. All participants were evaluated to be capable of giving informed consent.
: Not applicable.
: The authors declare that they have no competing interest.