Funding for this research was provided by:
the Danish Foundation for Chiropractic Research and Post Graduate Education
Received: 21 May 2019
Accepted: 31 October 2019
First Online: 1 December 2019
Ethics approval and consent to participate
: The data collection was approved by the Danish Data Protection Agency as part of University of Southern Denmark’s joint registration (Journal no. 2015–57-0008). Patients were informed about the project and their rights and gave their written consent that their data would be used only for research purposes. According to Danish law, the study did not require ethics approval (Research Ethics Committee for the Region of Southern Denmark, journal no. S-20162000-109).
: Not applicable.
: The authors report the following potential conflict of interest: AK’s position at the University of Southern Denmark is financially supported by an unrestricted grant from the Danish Foundation for Chiropractic Research and Postgraduate Education.