Funding for this research was provided by:
Swedish Research Council for Health, Working Life and Welfare
Article History
First Online: 30 May 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study has been approved by the Regional Ethics Board in Uppsala, Sweden, Dnr: 2013/346.
: Informed consent was obtained from all individual participants included in the study.