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| Influence of Umeclidinium Bromide and Vilanterol Trifenatate on Airway Remodeling and Vascular Endothelial Function of Patients with COPD |
| LI Caiyan, WANG Jinna, MO Xiuling, FANG Yanhong |
| First-author's address: Department of Infectious Diseases, People's Hospital of Wuqing District in Tianjin City, Tianjin 301700, China |
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