References:
- Electrocardiogram - (http://www.nhlbi.nih.gov/health/health-topics/topics/ekg/)
- Coronary Heart Disease: Screening with Electrocardiography - (http://www.uspreventiveservicestaskforce.org/Page/Document/RecommendationStatementFinal/coronary-heart-disease-screening-with-electrocardiography)
Editor: Sudha Bhat
Technically Checked by: Lingaraj