Funding for this research was provided by:
Received: 30 September 2020
Accepted: 10 February 2021
First Online: 27 February 2021
Ethics approval and consent to participate
: The study was carried out in compliance with the Declaration of Helsinki and was evaluated by the Regional Committee for Medical and Health Research Ethics (2017/1559) and approved by a Data Protection Officer at Oslo University Hospital (17/16918). Eligible patients were given verbal- and written information about the study, and those providing written, informed consent were included.
: Not applicable.
: The authors declare that they have no competing interests.