1. Global Initiative for Asthma . Global Strategy for Asthma Management and Prevention. 2019. www.ginasthma.org Date last accessed: 31 Aug 2020.
2. National Heart, Lung, and Blood Institute. Update on Selected Topics in Asthma Management. A Report by the National Asthma Education and Prevention Program Coordinating Committee Expert Panel Working Group. https://www.nhlbi.nih.gov/health-topics/asthma-management-guidelines-2020-updates Date last updated: 18 Dec 2020.
3. Inhaled Combined Budesonide–Formoterol as Needed in Mild Asthma
4. European Medicines Agency . Guideline on the Pharmaceutical Quality of Inhalation and Nasal Products. London, EMA, 2006. Available from www.ema.europa.eu/docs/en_GB/document_library/Scientific_guideline/2009/09/WC500003568.pdf
5. US Foof and Drug Administration . Metered Dose Inhaler (MDI) and Dry Powder Inhaler (DPI) Quality Considerations: Guidance for Industry. www.fda.gov/downloads/drugs/guidancecomplianceregulatoryinformation/guidances/ucm070573.pdf Date last accessed: 31 Aug 2020.