Chronic Obstructive Pulmonary Disease

Living with COPD: American Lung Association
https://www.lung.org/lung-health-and-diseases/lung-disease-lookup/copd/living-with-copd/

COPD Symptoms and Causes: Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/copd/symptoms-causes/syc-20353679

Chronic Obstructive Pulmonary Disease: Centers for Disease Control and Prevention
https://www.cdc.gov/copd/index.html

Chronic Obstructive Pulmonary Disease: Chest and Lungs
https://patient.info/chest-lungs/chronic-obstructive-pulmonary-disease-leaflet

COPD and Emphysema: University of Michigan Medicine
https://www.uofmhealth.org/conditions-treatments/pulmonary/copd-emphysema

Chronic Obstructive Pulmonary Disease: National Jewish Health
https://www.nationaljewish.org/conditions/copd-chronic-obstructive-pulmonary-disease