1. CHDwiki http://homes.esat.kuleuven.be/∼bioiuser/chdwiki/index.php/Main_Page (accessed 11/04/14)
2. American Heart Association http://www.heart.org/HEARTORG/Conditions/CongenitalHeartDefects/Congenital-Heart-Defects_UCM_001090_SubHomePage.jsp (accessed 11/04/14)
3. Centers for Disease Control http://www.cdc.gov/ncbddd/heartdefects/facts.html (accessed 11/04/14)
4. Congenital Heart Public Health Consortium http://www.chphc.org/hostedsites/Pages/default.aspx (accessed 11/04/14)
5. An excess of deleterious variants in VEGF-A pathway genes in Down-syndrome-associated atrioventricular septal defects;Ackerman;Am. J. Hum. Genet.,2012