Funding for this research was provided by:
Aarhus Universitet (not applicable)
Aase og Ejnar Danielsens Fond (not applicable)
Received: 4 March 2019
Accepted: 22 October 2019
First Online: 9 November 2019
Ethics approval and consent to participate
: All participants provided written informed consent. The study was approved by The Danish Data Protection Agency (J. no. 2012–58-006) and by The Central Denmark Region Committees onHealth Research Ethics (M-20090027).
: Not applicable.
: The authors declare that they have no competing interests.