Clinical–functional characteristics and risk of exacerbation and mortality among more symptomatic patients with chronic obstructive pulmonary disease: a retrospective cohort study... by Dan Liu, Yan Chen, Xin Li, Wei Cheng, Cong Liu, Ping Chen, Ling Lin, Min-Hua Deng, Shan Cai, Qing Song, Xue-Shan Li, Yu-Qin Zeng, Zhi-Ping Yu, Li-Bing Ma

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