10.04.2008
opracowanie na podstawie: The prevention of chronic obstructive pulmonary disease exacerbations by salmeterol/fluticasone propionate or tiotropium bromide
J.A. Wedzicha, P.M.A. Calverley, T.A. Seemungal, G. Hagan, Z. Ansari, R.A. Stockley, for the INSPIRE Investigators
American Journal of Respiratory and Critical Care Medicine, 2008; 177: 19–26