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Dust Weight and Asthma Prevalence in the National Survey of Lead and Allergens in Housing (NSLAH) PMCID: PMC1817708 Lessons Learned for the National Children’s Study from the National Institute of Environmental Health Sciences/U.S. Environmental Protection Agency Centers for Children’s Environmental Health and Disease Prevention Research PMCID: PMC1281290 Methodologic and Logistic Issues in Conducting Longitudinal Birth Cohort Studies: Lessons Learned from the Centers for Children’s Environmental Health and Disease Prevention Research PMCID: PMC1281291 |