Footnotes

• Contributors All authors conceived, reviewed and approved the manuscript. GAW prepared the manuscript.

• Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests All authors published a systematic review discussed in this editorial and have been investigators on trials that have evaluated foot orthoses, which have been supplied for free or at a reduced cost.

• Patient consent Not required.

• Provenance and peer review Not commissioned; internally peer reviewed.