Funding for this research was provided by:
Dansk Kiropraktor Forening (R32-A977-B845))
Hospital Lillebaelt – Research counsel
Received: 3 May 2021
Accepted: 26 August 2021
First Online: 3 September 2021
: All participants gave oral and written informed consent for the study, which was approved by the Regional Committees on Health Research Ethics for Southern Denmark (ID: S-20160201).
: Not applicable.
: The authors declare that they have no competing interests.