Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2012-0793)
Regional Research and Development Grant (VGFOUREG-388201, VGFOUREG-229331)
Received: 18 October 2016
Accepted: 1 February 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: All participants provided written informed consent and all procedures were approved by the Regional Ethics Committee in Gothenburg (Dnr 897–11 and T439–13).
: Not applicable.
: The authors declare that they have no competing interests.
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