Received: 9 October 2019
Accepted: 26 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: All participants provided written informed consent to participate prior to inclusion. The study was evaluated by the Regional Committee for Medical and Health Research Ethics February 2, 2014 (2013/2359/REK South-East) and approved by the National Data Protection Official for Research (NSD October 15, 2014, project number 39122).
: Not applicable.
: The authors declare that they have no competing interests.