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	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 t Add to Reading List Document Date: 2013-06-06 11:08:20 Open Document File Size: 150,22 KB Share Result on Facebook

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 List