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https://www.cdc.gov/nchs/fastats/leading-causes-of-death.html

https://www.healthxchange.sg/asthma/complications-management/survive-asthma-without-inhaler

https://www.cprcertified.com/blog/first-aid-for-asthma-attacks

https://www.slideshare.net/DrSujayPatil1/management-of-respiratory-emergencies

https://www.statista.com/statistics/253908/global-prevalence-of-chronic-respiratory-diseases/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4933010/

https://www.consumerreports.org/first-aid/a-guide-to-smarter-cpr/

https://www.cdc.gov/nchs/images/databriefs/251-300/db293_fig4.png

https://hmsa.com/help-center/examples-of-medical-emergencies/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4933010/

https://www.bleedingcontrol.org/~/media/bleedingcontrol/files/stop%20the%20bleed%20booklet.ashx

https://www.statista.com/statistics/527432/unintentional-injury-related-death-rate-in-the-us-by-principal-type/

www.encyclopedia.com/medicine/diseases-and-conditions/pathology/hemorrhage.