Funding for this research was provided by:
Helse Sør-Øst RHF (2013132)
Received: 27 May 2021
Accepted: 1 September 2021
First Online: 13 September 2021
: The study was approved by the Regional Ethics Committee South-East (Reg.nr: 2014/435) and by the National Committee for Medical and Health Research Ethics (Reg.nr: 2014/160) as well as the Data Protection officer at Akershus University Hospital (Reg.nr: 13/138).The requirement of obtaining informed consent from participants was waived by the National Committee for Medical and Health Research Ethics because it was deemed 1) difficult to obtain consent, 2) that the research was of significant interest to society and 3) and that the participants’ welfare and integrity would be safeguarded.All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable
: TR is an associate editor for BMC Health Services Research. The authors declare that they have no further competing interests.