Funding for this research was provided by:
Practise Research Foundation of Danish Physiotherapists (X)
Received: 4 September 2018
Accepted: 27 November 2018
First Online: 10 December 2018
: All participants signed written informed consent forms and the study was approved by the Danish Data Protection Agency (No. 2012–58-006). Under Danish law this study did not need ethics approval (Act on Research Ethics Review of Health Research Projects, October 2013) [CitationRef removed].
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.