1. Centers for Disease Control and Prevention. Data and Statistics for Congenital Heart Disease. Retrieved from: http://www.cdc.gov/ncbddd/heartdefects/data.html; on 15.03.15.
2. American Heart Association. Understand Your Risk for Congenital Heart Defects. Retrieved from: http://www.heart.org/HEARTORG/Conditions/CongenitalHeartDefects/UnderstandYourRiskforCongenitalHeartDefects/Understand-Your-Risk-for-Congenital-Heart-Defects_UCM_001219_Article.jsp; on 15.03.15.
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