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Date: 2013-06-06 11:08:20 | American Journal of Epidemiology ª The AuthorPublished by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health. This is an Open Access article distributed under the terms of tAdd to Reading ListSource URL: nersp.osg.ufl.eduDownload Document from Source WebsiteFile Size: 150,22 KBShare Document on Facebook |