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1. American Heart Association. “Heart Attack Symptoms, Risk Factors, and Awareness.” www.heart.org/en/health-topics/heart-attack/warning-signs-of-a-heart-attack.
2. Mayo Clinic. “Heart Attack.” www.mayoclinic.org/diseases-conditions/heart-attack/symptoms-causes/syc-20373106.
3. World Health Organization. “Cardiovascular Diseases (CVDs).” www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds).