Study objective: To compare the safety of salmeterol xinafoate or placebo added to usual asthma care. Design: A 28-week, randomized, double-blind, placebo-controlled, observational study.
During phase 2, subjects were recruited directly by the study investigators. The Salmeterol Multicenter Asthma Research Trial (SMART) was a multicenter, randomized, double-blind, parallel-group ...