1. Prevalence of asthma among adult females and males in the United States: results from the National Health and Nutrition Examination Survey (NHANES), 2001-2004;McHugh;J Asthma,2009
2. National Institutes for Health. Guidelines for the Diagnosis and Management of Asthma (EPR-3). http://www.nhlbi.nih.gov/health-pro/guidelines/current/asthma-guidelines, Accessed November 20, 2015.
3. GINA Report, Global Strategy for the Asthma Management and Prevention. Global Initiative for Asthma website. http://www.ginasthma.org/local/uploads/files/GINA_Report_2015.pdf. Accessed November 22, 2015.
4. European Medicines Agency. Relvar Ellipta. http://www.ema.europa.eu/ema/index.jsp?curl=pages/medicines/human/medicines/002673/human_med_001708.jsp&mid=WC0b01ac058001d124. Accessed November 21, 2015.
5. US Food and Drug Administration. Breo Ellipta. http://www.accessdata.fda.gov/scripts/cder/drugsatfda/index.cfm?fuseaction=Search.DrugDetails Accessed November 21, 2015.