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. 2015 Apr 7;123(10):1053–1058. doi: 10.1289/ehp.1308075

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Map of the study area showing the location of a sample subset of mothers [randomly selected with the QGIS tool “random points” (http://www.qgis.org/)], the location of the ground air monitoring stations, and the areas within and outside 30 km of an air temperature station (urban vs. rural areas).