Evaluation of the Characteristics of Asthma in Severe and Extremely Severe COPD

Feng-jia Chen, Geng-peng Lin, Xin-yan Huang, Yang-li Liu, Zhi-min Zeng, Yu-biao Guo
2019 International Journal of COPD  
doi:10.2147/copd.s225258 fatcat:ogw6ps3cd5eb7k6rmrici4rgde