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This is an update request for the document Associations between ambient air pollutant mixtures and pediatric asthma emergency department visits in three cities: a classification and regression tree approach by Katherine Gass, Mitch Klein, Stefanie E. Sarnat, Andrea Winquist, Lyndsey A. Darrow, W. Dana Flanders, Howard H. Chang, James A. Mulholland, Paige E. Tolbert and Matthew J. Strickland

Your paper was deposited in MUCC (Crossref) and appears online at https://ehjournal.biomedcentral.com/track/pdf/10.1186/s12940-015-0044-5?site=ehjournal.biomedcentral.com
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