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Maartje M van Stralen*, Gerjo Kok, Hein de Vries, Aart N Mudde, Catherine Bolman and Lilian Lechner
* Corresponding author: Maartje M van Stralen Maartje.vanStralen@ou.nl
BMC Public Health 2008, 8:399 doi:10.1186/1471-2458-8-399
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