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Correction notice This paper has been amended since it was published Online First. The wording “PEDro synthesis” has been added to the end of the paper's title.
Contributors PWS and JD selected the review and interpreted the findings. PWS wrote the initial draft. PWS and JD critically appraised the paper, commented on manuscript drafts and approved the final version.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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