Comparison of sample characteristics in two pregnancy cohorts: community-based versus population-based recruitment methods

Abstract
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Article deposited according to publisher policies: http://www.biomedcentral.com/about/copyright [July 9, 2014]
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Leung et al.: Comparison of sample characteristics in two pregnancy cohorts: community-based versus population-based recruitment methods. BMC Medical Research Methodology 2013 13:149. doi:10.1186/1471-2288-13-149