Preventive Effects of Qingfei Yihuo Capsules (清肺抑火胶囊) on Air Pollution Associated Exacerbation of Chronic Obstructive Pulmonary Disease: A Single-blind, Randomized, Controlled Trial

2020 ◽  
Vol 26 (11) ◽  
pp. 806-811
Author(s):  
Wei-ping Hu ◽  
Xiao-dan Wu ◽  
Zhuo-zhe Li ◽  
Jing Zhang
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