Umeclidinium/Vilanterol Compared with Fluticasone Propionate/Salmeterol, Budesonide/Formoterol, and Tiotropium as Initial Maintenance Therapy in Patients with COPD Who Have High Co... by Kalhan R, Slade D, Ray R, Moretz C, Germain G, Laliberté F, Shen Q, Duh MS, MacKnight SD, Hahn B

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