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Contributors RB, BC and JE: each wrote sections of the initial draft of the article, which were then discussed and refined by all authors.
Funding The Oslo Sports Trauma Research Center has been established through generous grants from the Eastern Norway Regional Health Authority, the International Olympic Committee, the Royal Norwegian Ministry of Culture, Norsk Tipping AS and the Norwegian Olympic and Paralympic Committee & Confederation of Sport. The Football Research Group was established in Linköping, Sweden through grants from UEFA, the Swedish Football Association and the Swedish National Centre for Research in Sports.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Correction notice The paper has been corrected since it was published Online First. This paper is a revision of article bjsports-2017-098160: the authors asked for the opportunity to expand their text and references in response to post publication feedback. The BJSM editors sent the revised version for additional peer review. The authors responded to those peer-review comments.