Ambient PM2.5 and cardiopulmonary mortality in the oldest-old people in China: A national time-stratified case-crossover study

Cuiling Wu, Guanhao He, Wei Wu, Ruilin Meng, Chunliang Zhou, Guoxia Bai, Min Yu, Weiwei Gong, Biao Huang, Yize Xiao, Jianxiong Hu, Jianpeng Xiao, Fangfang Zeng, Pan Yang, Dan Liu, Qijiong Zhu, Zhiqing Chen, Siwen Yu, Cunrui Huang, Yaodong Du, Xiaofeng Liang, Tao Liu, Wenjun Ma