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Contributors RC, LO and ESM conceived the study. RC performed the data analysis. All authors critically appraised the manuscript and approved the final version.
Competing interests None declared.
Patient consent Obtained.
Ethics approval St. Vincent's University Hospital Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement Data used in this study are held in Bone and Joint Unit, St. Vincent's University Hospital, Dublin, Ireland under the custody of EM and can be made available on request.