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This paper is dedicated to the memory of Andy Sprowson who died tragically on 13 March 2015. He was an academic orthopaedic surgeon who was dedicated to improving evidence based care in his field. He was an exceptionally enthusiastic, bubbly character, who loved to work hard and make new and exciting things happen. He will be sadly missed by both his academic and clinical colleagues.
Contributors: All three authors jointly wrote the article and are responsible for the overall content as guarantors.
Funding: RB is funded by an Australian National Health and Medical Research Council (NHMRC) senior principal research fellowship.
Competing interests: None declared.
Provenance and peer review: Commissioned; externally peer reviewed.
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