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Tim Meyer is the Chair of the UEFA and German FA Medical Committees. John MacLean is the Vice-Chair of the UEFA Medical Committee and the Chief Medical Consultant for the Scottish Football Association.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflicts of interest"}},{"value":"Robert McCunn received funding from Hampden Sports Clinic to conduct an initial version of the review for presentation to the UEFA Medical Committee prior to the subsequent decision to submit the work for publication. No other sources of funding were used to assist in the preparation of this article.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Funding"}},{"value":"RM wrote the first draft of the manuscript. RM and FB conducted database searches, article identification, data extraction and methodological quality assessments. KS, TM and JM revised the original manuscript. All authors read and approved the final manuscript.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Author contributions"}},{"value":"There are no underlying data to share.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Data availability statement"}}]}}