aResearch Unit for General Practice in Aalborg, Department of Clinical Medicine, Aalborg University, Aalborg, Denmark, Europe
bCenter for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark, Europe
Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.
Received January 11, 2017
Received in revised form January 13, 2017
Accepted January 17, 2017