Funding for this research was provided by:
Vetenskapsrådet (VR 2011-2718)
Article History
Received: 11 October 2018
Accepted: 12 June 2019
First Online: 1 July 2019
Ethics approval and consent to participate
: The study protocol was approved by the Regional Ethical Review Board in Gothenburg, Sweden (No. 225–08). All participants gave informed, written consent prior to their participation in the study.
: Not applicable.
: The authors declare that they have no competing interests.