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. 2011 Mar 15;8(3):861–874. doi: 10.3390/ijerph8030861

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© 2011 by the authors; licensee MDPI, Basel, Switzerland

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Demographic comparison of enrolled participants (Cochran Cohort & Parmer Cohort) versus all eligible individuals in each county (Cochran County & Parmer County) for race/ethnicity, age, education, and gender.