1. Masoli M, Fabian D, Holt S, Beasley R, The Global Initiative for Asthma. Global burden of asthma. Available at http://www.ginasthma.org/local/uploads/files/GINABurdenReport_1.pdf (accessed 6 December 2013).
2. Global Initiative for Asthma. Global strategy for asthma management and prevention. Updated 2012. Available at http://www.ginasthma.org/local/uploads/files/GINA_Report_2012Feb13.pdf (accessed 6 December 2013).
3. Reddel HK, Taylor DR, Bateman ED, Boulet LP, Boushey HA, Busse WW et al. An official American Thoracic Society/European Respiratory Society statement: asthma control and exacerbations: standardizing endpoints for clinical asthma trials and clinical practice. Am J Respir Crit Care Med 2009; 180: 59–99.
4. National Heart, Lung, and Blood Institute. Expert Panel Report 3: Guidelines for the diagnosis and management of asthma. Available at http://www.nhlbi.nih.gov/guidelines/asthma/asthgdln.htm (accessed 15 November 2013).
5. Barnes PJ . New therapies for asthma: is there any progress? Trends Pharmacol Sci 2010; 31: 335–343.