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The Urban Environment and Childhood Asthma (URECA) birth cohort study: design, methods, and study population

James E Gern*, Cynthia M Visness, Peter J Gergen, Robert A Wood, Gordon R Bloomberg, George T O'Connor, Meyer Kattan, Hugh A Sampson, Frank R Witter, Megan T Sandel, Wayne G Shreffler, Rosalind J Wright, Samuel J Arbes and William W Busse

BMC Pulmonary Medicine 2009, 9:17  doi:10.1186/1471-2466-9-17

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