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The 20 m shuttle run is not a valid test of cardiorespiratory fitness in boys aged 11–14 years

Crossref DOI link: https://doi.org/10.1136/bmjsem-2019-000627

Published Online: 2019-12-22

Published Print: 2019-12

Update policy: https://doi.org/10.1136/crossmarkpolicy

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