3van Noord JA, Bantje TA, Eland ME, et al. A randomised controlled comparison of tiotropium and ipratropium in the treatment of chronic obstructive pulmonary disease.The Dutch Tiotropium Study Group.Thorax,2000;55 : 289 - 294.
4Dowling RB, Johnson M, Cole PJ, et al. Effect of salmeterol onaemophilus intluenzae infection of respiratory mucosa in vitro. Eurespir J, 1998 ; 11:86 - 90.
5Crompton GK, Ayres JG, Basran G, et al. Comparison of oral bambuterol and inhaled salmeterol in patients with symptomatic asthma and using inhaled corticosteroids. Am J Resplr Crit Care Med, 1999 ; 159 : 824 - 828.
6Culpitt SV, de Matos C, Russell RE, et al. Effect of theophylline on induced sputum inflammatory indices and neutrophil chemotaxis in COPD.Am J Respir Cfit Care Med,2002;165:1371 - 1376.
7ZuWallack RL, Mahler DA, Reilly D, et al. Salmeterol plus theophylline combination therapy in the treatment of COPD. Chest, 2001 ; 119:1661-1670.
8Barnes PJ. Scientific rationale for inhaled combination therapy with long acting β2 agonistits and corticosteroids. Eur Respir J,2002 ; 19:182-191.
