Received: 5 June 2021
Accepted: 25 August 2021
First Online: 9 September 2021
: The study was approved by the Norwegian Regional Ethics Committee South East (2015/195) and performed in accordance with the Helsinki declaration. Written informed consent was obtained from all participants in the study.
: Not applicable
: ME received grants from Sophies Minde Ortopedi AS. Sophies Minde Ortopedi AS is a non-commercial subsidiary company of Oslo University Hospital. The other authors have declared no competing interests.