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Nicholls AR, Madigan DJ, Fairs LRW, Bailey R.Nicholls AR, et al.BMJ Open Sport Exerc Med. 2020 Feb 24;6(1):e000711. doi: 10.1136/bmjsem-2019-000711. eCollection 2020.BMJ Open Sport Exerc Med. 2020.PMID: 32153985Free PMC article.