Funding for this research was provided by:
Foundation for Chiropractic and Clinical Biomechanics in Denmark (95-154-72 489)
Text and Data Mining valid from 2020-02-11
Received: 9 October 2019
Accepted: 9 January 2020
First Online: 11 February 2020
Ethics approval and consent to participate
: All participants provided written informed consent. Approval by the local ethical committee was not needed due to the study’s methodological nature. A letter of exemption from Regional Committee on Health Research Ethics is available from the author on request (case no. 48336). According to journal number 2015–414037 the Danish Data Protection Agency has approved the project.
: Not applicable.
: The authors declare that they have no competing interests.