Interaction effect of chronic cough and ageing on increased risk of exacerbation in patients with asthma: a prospective cohort study in a real-world setting by Fan Ding Jin, Ji Wang, Su Jun Deng, Woo-Jung Song, Xin Zhang, Chang Yong Wang, Si Yang Gao, Kian Fan Chung, Ye Yang, Anne E. Vertigan, Feng Ming Luo, Surinder S. Birring, Wei Min Li, Dan Liu, Gang Wang

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