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The Active plus protocol: systematic development of two theory- and evidence-based tailored physical activity interventions for the over-fifties

Maartje M van Stralen*, Gerjo Kok, Hein de Vries, Aart N Mudde, Catherine Bolman and Lilian Lechner

BMC Public Health 2008, 8:399  doi:10.1186/1471-2458-8-399

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