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"“Maintenance therapy with budesonide and formoterol in chronic obstructive pulmonary disease” P.M. Calverley, W. Boonsawat, Z. Cseke, N. Zhong, S. Peterson, H. Olsson. Eur Respir J 2003; 22: 912–919.." European Respiratory Journal
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Web. 19 April. 2024.