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Lin, Hualiang, Guo, Yanfei, Nelson, Erik J., Qian, Zhengmin, Ma, Wenjun, Wu, Fan, Di, Qian, Zheng, Yang, Kowal, Paul, Xiao, Jianpeng, Liu, Tao, Li, Xing, Zeng, Weilin, Howard, Steven W.. Lippincott Williams & Wilkins; 2017. Ambient PM2.5 and stroke: effect modifiers and population attributable risk in six low- and middle-income countries.