Impacts of COPD exacerbation history on mortality and severe cardiovascular events among patients with COPD in China: a retrospective cohort study by Dongni Hou, Zhike Liu, Xinli Li, Peng Shen, Wenhao Li, Meng Zhang, IokFai Cheang, Hongbo Lin, Siyan Zhan, Feng Sun, Yan Chen, Yuanlin Song

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