1. Global Initiative for Chronic Obstructive Lung Disease. Global strategy for the diagnosis, management and prevention of chronic obstructive pulmonary disease 2021 report; 2021. Available from: https://goldcopd.org/wp-content/uploads/2020/11/GOLD-REPORT-2021-v1.1-25Nov20_WMV.pdf. Accessed March 05, 2021.
2. Global Initiative for Asthma. Asthma Management and Prevention for Adults and Children Older than 5 Years: A Pocket Guide for Health Professionals; 2020. Available from: https://ginasthma.org/wp-content/uploads/2020/04/Main-pocket-guide_2020_04_03-final-wms.pdf. Accessed March 05, 2021.
3. National Institute for Health and Care Excellence. Asthma: tiotropium (Spiriva Respimat). 2015. Available from: https://www.nice.org.uk/advice/esnm55/chapter/Key-points-from-the-evidence. Accessed March 05, 2021.
4. European Medicines Agency. Anoro Ellipta (umeclidinium bromide/vilanterol) An overview of Anoro Ellipta and why it is authorised in the EU; 2018. Available from: https://www.ema.europa.eu/en/documents/overview/anoro-ellipta-epar-medicine-overview_en.pdf. Accessed 26 June, 2020.
5. European Medicines Agency. Incruse Ellipta (umeclidinium bromide) An overview of Incruse Ellipta and why it is authorised in the EU; 2018. Available from: https://www.ema.europa.eu/en/documents/overview/incruse-ellipta-epar-medicine-overview_en.pdf. Accessed 18 June, 2020.