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. Setting ...

The use of a cusp-bearing homograft patch to the outflow tract and pulmonary artery in Fallot's tetralogy and pulmonary valvular stenosis (1 November, 1967) ...