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Contributors Both authors designed the study. AGC drafted the manuscript. KMC revised the manuscript for important intellectual content. Both authors approved the final version for publication.
Funding AGC is supported by a European Union Seventh Framework Programme (FP7-PEOPLE-2013-ITN; KNEEMO) under grant agreement number 607510. The funding source had no involvement in any aspect of this editorial.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.