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Effect of four additional physical education lessons on body composition in children aged 8–13 years – a prospective study during two school years

Heidi Klakk*, Mai Chinapaw, Malene Heidemann, Lars Bo Andersen and Niels Wedderkopp

BMC Pediatrics 2013, 13:170  doi:10.1186/1471-2431-13-170

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