Salmeterol and fluticasone propionate combined in a new powder inhalation device for the treatment of asthma: a randomized, double-blind, placebo-controlled trial - Kavuru,M.; Melamed,J.; Gross,G.; Laforce,C.; House,K.; Prillaman,B.; Baitinger,L.; Woodring,A.; Shah,T. (J Allergy Clin Immunol, 2000)