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2. Physical activity: more of the same is not enough;Hallal;Lancet,2012
3. How active are our children? Findings from the Millennium Cohort Study;Griffiths;BMJ Open,2013
4. Global recommendations on physical activity for health;WHO,2010
5. Growing up in Ireland, National Longitudinal Study of Children, Report 1: the lives of 9-year-olds;Williams,2009