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4. Women don't get to hospital fast enough during heart attack: Study finds pre-hospital delays linked to more deaths among women. American College of Cardiology. http://www.acc.org/about-acc/press-releases/2015/03/05/16/33/women-dont-get-to-hospital-fast-enough-during-heart-attack. Published March 5, 2015. Accessed August 31, 2015.
5. Categories of arrhythmias. Texas Heart Institute. http://www.texasheart.org/HIC/Topics/Cond/arrhycat.cfm. Accessed September 4, 2015.