1. National Asthma Education and Prevention Programme. Expert Panel Report: Guidelines for the Diagnosis and Management of Asthma;National Institutes of Health,1997
2. National Asthma Education and Prevention Programme Expert Panel Report: guidelines for the diagnosis and management of asthma update on selected topics 2002;National Institutes of Health, National Heart, Lung, and Blood Institute;J Allergy Clin Immunol,2002
3. Low-dose inhaled corticosteroids and the prevention of death from asthma;Suissa;N Engl J Med,2000
4. Efficacy and safety of inhaled corticosteroids: new developments;Barnes;Am J Respir Crit Care Med,1998