Article History
Received: 27 April 2018
Accepted: 6 July 2018
First Online: 23 July 2018
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 protocol was approved by the Ethical Review Board in Linköping, Sweden (Dnr. 2011/41-31) and is registered at clinicaltrials.gov (NCT01446757).
: All participants provided written informed consent prior to baseline assessment.