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Reliability and validity of two frequently used self-administered physical activity questionnaires in adolescents

Vegar Rangul email, Turid Lingaas Holmen email, Nanna Kurtze email, Koenraad Cuypers email and Kristian Midthjell email

BMC Medical Research Methodology 2008, 8:47doi:10.1186/1471-2288-8-47

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