Effects of ambient carbon monoxide on daily hospitalizations for cardiovascular disease: a time-stratified case-crossover study of 460,938 cases in Beijing, China from 2013 to 2017 oleh Haibin Li, Jingwei Wu, Anxin Wang, Xia Li, Songxi Chen, Tianqi Wang, Endawoke Amsalu, Qi Gao, Yanxia Luo, Xinghua Yang, Wei Wang, Jin Guo, Yuming Guo, Xiuhua Guo