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The author is with the Research Institute for Sport & Exercise Science at John Moores University, Liverpool, UK L3 2ET.
Correspondence regarding this article should be addressed to David Gilbourne, Research Institute for Sport and Exercise Science, Liverpool John Moores University, Henry Colton Campus, 15-21 Webster Street, Liverpool, UK L3 2ET. E-mail may be sent to: <D.Gilbourne@livjm.ac.uk<.