Received: 11 July 2019
Accepted: 7 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The Regional Committee for Medical Research Ethics Norway has approved the study (reference number 2016/1476). Each participant will receive information about the study, both orally and written. They will be informed that their participation would be voluntary and that they will be able to withdraw from the study at any time. Before inclusion, the participants will be asked for their oral and written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.