1. Global Initiative for Asthma. Global Strategy for Asthma Management and Prevention NHLBI/WHO Workshop Report. 2006. Disponible en: http://www.ginasthma.com.
2. British Thoracic Society, Scottish Intercollegiate Guidelines Network. British guideline on the management of asthma. 2007. Disponible en: http://www.sign.ac.uk/guidelines.
3. Nacional Asthma Education and Prevention Program. Expert Panel Report 3: Guidelines for the diagnosis and management of asthma. Bethesda: National Institutes of Health, National Heart, Lung, and Blood Institute; 2007.
4. Guía Española para el Manejo del Asma (GEMA). Disponible en: http://www.gemasma.com.
5. The Salmeterol Multicenter Asthma Research Trial: a comparison of usual pharmacotherapy for asthma or usual pharmacotherapy plus salmeterol;Nelson;Chest,2006