Funding for this research was provided by:
Received: 26 June 2019
Accepted: 30 October 2019
First Online: 17 January 2020
Ethics approval and consent to participate
: Ethical approval for the study was granted by the Ethical Review Board of Gothenburg, Sweden (489–17). Informed consent from the patients was not needed as the study only involved retrospective review of medical records and scoring of radiographic images and no actual handling of patients.
: Not applicable.
: The authors declare that they have no competing interests.