Factors influencing the prevalence and death rate of COPD: a pan-database ecological study covering 201 countries and regions from 1990 to 2021Research in context by Zihui Wang, Wenhan Cao, Zhixuan You, Shaoqiang Li, Mingshan Xue, Haiyang Li, Junfeng Lin, Guannan Cai, Yuqi Chen, Zhiman Liang, Chengtao Zhou, Xiaofang Wu, Guanghui Dong, Nanshan Zhong, Baoqing Sun, Zhangkai J. Cheng

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