Funding for this research was provided by:
Førde Hospital Trust
Received: 20 January 2020
Accepted: 18 May 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical Research Ethics in Western Norway (reference number: 2016/2693). The participants provided informed written consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.