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http://www.who.int/mediacentre/factsheets/fs307/en/
. Accessed date Jul 2013
2. Global Initiative for Asthma (2012) Global strategy for asthma management and prevention. Updated 2012.
http://www.ginasthma.org/local/uploads/files/GINA_Report_March13.pdf
. Accessed 15 Jul 2013
3. World Health Organization (2010) Chronic respiratory diseases.
http://www.who.int/gard/publications/chronic_respiratory_diseases.pdf
. Accessed 15 Jul 2013
4. Akinbami LJ, Moorman JE, Bailey C et al (2012) Trends in asthma prevalence, health care use, and mortality in the United States, 2001–2010. NCHS data brief, no 94. National Center for Health Statistics, Hyattsville
5. Global Initiative for Asthma (2013) Global burden of asthma.
http://www.ginasthma.org/Global-Burden-of-Asthma
. Accessed 15 Jul 2013