The Urban Environment and Childhood Asthma (URECA) birth cohort study: design, methods, and study population by Sandel Megan T, Witter Frank R, Sampson Hugh A, Kattan Meyer, O'Connor George T, Bloomberg Gordon R, Wood Robert A, Gergen Peter J, Visness Cynthia M, Gern James E, Shreffler Wayne G, Wright Rosalind J, Arbes Samuel J, Busse William W

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