Received: 6 November 2019
Accepted: 4 June 2020
First Online: 26 June 2020
Change Date: 8 December 2020
Change Type: Update
Change Details: Open Access Funding note was added to backmatter text of the article. This article has been updated to correct this.
Ethics approval and consent to participate
: The study protocol was approved by the Regional Ethical Review Board (Dnr. 2011/41–31), and informed written consent was given by the participants.
: Not applicable.
: The authors declare they have no competing interests.