scholarly journals Characteristics of Patients with Chronic Obstructive Pulmonary Disease Exposed to Different Environmental Risk Factors: A Large Cross-Sectional Study

2020 ◽  
Vol Volume 15 ◽  
pp. 2857-2867
Author(s):  
Jia-xi Duan ◽  
Wei Cheng ◽  
Yu-qin Zeng ◽  
Yan Chen ◽  
Shan Cai ◽  
...  
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