A multicenter, randomized, double-blind, parallel group, placebo controlled study to investigate the effects of salmeterol/fluticasone 50/500mcg bd, salmeterol 50mcg bd, and fluticasone 500mcg bd, all delivered via the DISKUS/ACCUHALER inhaler, on the survival of subjects with chronic obstructive pulmonary disease over 3 years of treatment.
