Biological maturation, relative age and self-regulation in male professional academy soccer players: A test of the underdog hypothesis von Cumming, Sean P., Searle, Chris, Hemsley, Janie K., Haswell, Finlay, Edwards, Hannah, Scott, Sam, Gross, Aleks, Ryan, Desmond, Lewis, Jeff, White, Paul, Cain, Andrew, Mitchell, Siobhan B., Malina, Robert M.

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