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What should I do if someone is choking? NHS Choices. https://www.redcross.org/images/MEDIA_CustomProductCatalog/m4240170_Adult_ready_reference.pdf. Updated October 30, 2015. Accessed September 2016.
CPR & First Aid. Part 5: Adult basic life support and cardiopulmonary resuscitation quality. American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. https://eccguidelines.heart.org/index.php/circulation/cpr-ecc-guidelines-2/part-5-adult-basic-life-support-and-cardiopulmonary-resuscitation-quality/?strue=1&id=9-5. Updated 2010 and 2015. Accessed September 2016.