Feldman GJ, Edin A (December 2013). "The combination of umeclidinium bromide and vilanterol in the management of chronic obstructive pulmonary disease: current evidence and future prospects". Therapeutic Advances in Respiratory Disease. 7 (6): 311–9. doi:10.1177/1753465813499789. PMID24004659. S2CID5744282.
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Feldman GJ, Edin A (December 2013). "The combination of umeclidinium bromide and vilanterol in the management of chronic obstructive pulmonary disease: current evidence and future prospects". Therapeutic Advances in Respiratory Disease. 7 (6): 311–9. doi:10.1177/1753465813499789. PMID24004659. S2CID5744282.
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Feldman GJ, Edin A (December 2013). "The combination of umeclidinium bromide and vilanterol in the management of chronic obstructive pulmonary disease: current evidence and future prospects". Therapeutic Advances in Respiratory Disease. 7 (6): 311–9. doi:10.1177/1753465813499789. PMID24004659. S2CID5744282.