1[2]Politiek MJ,Boorsma et al,Comparison of fomoteral,salbuamol and salmeterol in methacholine-induced severe bronchoconstriction. Eur Respir J, 1999,13 ( 5 ): 988～992
2[3]Mapel D, Roblin D, et al,Survival of COPD patients exposed to inhaled corticosteroids. Chest, 2002,122(4 Suppl):74S
3[4]Price DB,Wolfe S et al,Dose increasing complexity of treatment regimens using additional therapy with long-acting beta-agonists reduce compliance .Eur Respir J, 1998,12(Suppl28):41s.
