AbstractGet full access to this articleView all access options for this article.Get accessReferences1.National Asthma Education and Prevention Program Expert Panel Report 2. Guidelines for the diagnosis and management of asthma. Available at http://www.nhlbi.nih.gov/guidelines/asthma/asthgdIn.htm. Accessed Oct 23, 2001.2.Worldwide variability in prevalence of symptoms of asthma, allergic rhinoconjunc- tivitis, and atopic eczema. The International Study of Asthma and Allergies in Child- hood (ISAAC) Steering Committee. Lancet 1998;351(9111):1225–1232.