1. Cardiovascular Diseases
https://www.who.int/health-topics/cardiovasculardiseases/tab=tab3
2. Braunwald’s Heart Disease E-Book: A Textbook of Cardiovascular Medicine;Zipes,2018
3. Apple Watch Series 4
https://www.apple.com/ca/apple-watch-series-4/health
4. Alive cor
https://www.alivecor.com/
5. Omron ecg Monitor hcg-801
https://zenicor.com/zenicor-ekg/