Real-world effectiveness of umeclidinium/vilanterol versus fluticasone propionate/salmeterol as initial maintenance therapy for chronic obstructive pulmonary disease (COPD): a retrospective cohort study
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R. Stanford | R. Ray | L. Bengtson | L. Sharpsten | B. Hahn | E. Koep | C. Moretz | J. Tong | L. Le