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de Graaf LE, Gerhards SA, Evers SM, Arntz A, Riper H, Severens JL, Widdershoven G, Metsemakers JF, Huibers MJ.de Graaf LE, et al. Among authors: evers sm.BMC Public Health. 2008 Jun 30;8:224. doi: 10.1186/1471-2458-8-224.BMC Public Health. 2008.PMID: 18590518Free PMC article.Clinical Trial.