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Journal of Thoracic Disease|July 10, 2020
Clinical characteristics of COVID-19 infection in chronic obstructive pulmonary disease: a multicenter, retrospective, observational studyFan Wu, Yumin Zhou, Zhongfang Wang, et al.The New England Journal of Medicine|September 7, 2017
Tiotropium in Early-Stage Chronic Obstructive Pulmonary DiseaseYumin Zhou, Nan-Shan Zhong, Xiaochen Li, et al.Pageof 42