Received: 3 September 2020
Accepted: 28 December 2020
First Online: 8 January 2021
Ethics approval and consent to participate
: The Helsinki declaration was followed. The Regional Committee on Medical and Health Research Ethics (REK) determined that the study was in the category health services research and therefore did not need approval (2018/1129/ REK sør-øst). Health service research is not included in the Health Research Act and is therefore not obligated to get approval from REK [CitationRef removed]. The research protocol was approved by the Norwegian Centre for Research Data (NSD, ref.nr 61366 AMS/LR) before start of the project. All participants signed an informed written consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.