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https://www.copdfoundation.org/
https://www.mayoclinic.org/diseases-conditions/copd/symptoms-causes/syc-20353679
https://www.lung.org/lung-health-and-diseases/lung-disease-lookup/copd/
https://www.nhlbi.nih.gov/health-topics/copd
https://www.healthline.com/health/copd
https://www.cdc.gov/copd/index.html
https://medlineplus.gov/copd.html
https://www.copd.com/about-copd/
https://my.clevelandclinic.org/health/diseases/8709-chronic-obstructive-pulmonary-disease-copd
https://emedicine.medscape.com/article/297664-overview
