Funding for this research was provided by:
Örebro University
Article History
Received: 4 September 2018
Accepted: 28 January 2019
First Online: 13 February 2019
Compliance with ethical standards
: The study has been approved by the Regional Ethical Review Board in Stockholm region (Dnr: 2017/1640–31).
: The authors declare that they have no conflict of interest.