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- http://www.who.int/mediacentre/factsheets/fs315/en/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4825818/
- https://www.mayoclinic.org/diseases-conditions/copd/symptoms-causes/syc-20353679
- https://www.ncbi.nlm.nih.gov/pubmed/23527684
- https://www.lung.org/lung-health-diseases/lung-disease-lookup/copd/what-causes-copd
- https://www.cdc.gov/tobacco/data_statistics/fact_sheets/health_effects/effects_cig_smoking/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4825818/
- https://www.lung.org/policy-advocacy/tobacco/smokefree-environments
- https://www.emphysemafoundation.org/index.php/news-and-events/archives/83-copd-emphysema-articles
- http://www.lung.org/assets/documents/research/rise-of-copd-in-women-summary.pdf
- https://www.lung.org/lung-health-diseases/lung-disease-lookup/copd/learn-about-copd
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