Article History
Received: 28 May 2020
Accepted: 18 November 2020
First Online: 25 November 2020
Ethics approval and consent to participate
: Study approval was obtained from the Regional Committee for Medical and Health Research Ethics, region south east Norway. All participants provided oral informed consent, because the data were anonymous. The ethics committee approved this procedure.
: Not applicable.
: The authors declare they have no potential competing interests.