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Is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Dregan et al. BMC Public Health 2011, 11:86 http://www.biomedcentral.com/1471-2458/11/Page 2 ofThe present study therefore aimed to e

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