1.Mitchell SC, Korones SB, Berendes HW. Congenital heart disease in 56,109 births. Incidence and natural history. Circulation. 1971;43:323–332. doi: 10.1161/01.CIR.43.3.323. 2.Hoffman JI, Kaplan S. The incidence of congenital heart disease. J Am Coll Cardiol.2002;39(12):1890–1900. doi: 10.1016/S0735-1097(02)01886-7. 3.Rao PS. Diagnosis and management of cyanotic congenital heart disease: part I. Indian J Pediatr. 2009;76(1):57–70. doi: 10.1007/s12098-009-0030-4.4.eurocat-network.eu [Internet]. Cases and prevalence (per 10,000 births) for all full member registries from 2010 to 2014 [cited 2017 Apr 19]. Available from: http://www.eurocat-network.eu/ accessprevalencedata/prevalencetables. 5.Hoffman JI, Kaplan S, Liberthson RR. Prevalence of congenital heart disease. Am Heart J. 2004;147(3):425–439. doi: 10.1016/ j.ahj.2003.05.003. 6.Becker S, Al Halees Z. First-cousin matings and congenital heart disease in Saudi Arabia. Community Genet. 1999;2(2–3):69–73. doi: 10.1159/000016189. 7.van der Linde D, Konings EE, Slager MA, et al. Birth prevalence of congenital heart disease worldwide: a systematic review and meta-analysis. J Am Coll Cardiol. 2011;58(21):2241–2247. doi: 10.1016/j.jacc.2011.08.025.