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Article History

Received: 17 October 2019

Accepted: 19 June 2020

First Online: 1 July 2020

Ethics approval and consent to participate

: The research related to human use complies with all the relevant national regulations and institutional policies, was performed in accordance with the tenets of the Helsinki Declaration, and was approved by the Regional Ethics Board in Umeå, Sweden (Dnr 2012–446-31 M). The study was registered on (Protocol ID SE-Dnr-2012-446-31 M-2, ClinicalTrials ID NCT01838603). The COREQ Equator checklist was used. Written informed consent was obtained from all individuals included in this study. Consent was confirmed during the interview and when the subjects were contacted for verification and presented with the results.

: Not applicable.

: JH and KSH are stock-owners of the interventional clinic where the research was performed. JH is a member of the Spine Intervention Society Evidence Base committee. K-GS has no potential conflicts of interest.