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. 2016 Apr 29;124(10):1547–1553. doi: 10.1289/EHP192

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Schematic representation of the study period. Exposure 1: average PM_2.5 concentration in 2007; exposure 2: average PM_2.5 concentration between 2007 and 2010. PM_2.5, particulate matter with an aerodynamic diameter ≤ 2.5 μm.