Short-term effects of extreme air pollutant concentrations on coronary heart disease hospitalization in Henan province: a time-stratified case-crossover study by Shuming Liu, Yongbin Wang, Lujie Wang, Xuefang Li, Menghui Fei, Pingshuan Dong, Kan Yang, Hui Liu, Na Xie, Hengwen Chen, Guang Chen, Huan Li, Xiayan Zang, Jun Li, Zhigang Chen, Fei Lin, Fei Lin, Guoan Zhao, Guoan Zhao

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