1. Our impact. (2022). Accessed. August 25, 2022: https://www.lung.org/about-us/our-impact.
2. Interactive summary health statistics for adults — 2019-2021. (2018). Accessed. August 25, 2022: https://wwwn.cdc.gov/NHISDataQueryTool/SHS_adult/index.html.
3. Chronic obstructive pulmonary disease (COPD) includes. chronic bronchitis and emphysema. (2022). Accessed: January 18, 2022: https://www.cdc.gov/nchs/fastats/copd.htm.
4. Chronic obstructive pulmonary disease (COPD). (2022). Accessed. January 18, 2022: https://www.who.int/news-room/fact-sheets/detail/chronic-obstructive-pulmonary-disease-(COPD).
5. COPD symptoms & causes. (2020). Accessed. August 25, 2022: https://www.mayoclinic.org/diseases-conditions/copd/symptoms-causes/syc-20353679.