1. Pei L, Kang Y, Cheng Y, Yan H. The association of maternal lifestyle with birth defects in Shaanxi Province, Northwest China. PLoS ONE. 2015;10:1–13.
2. César G, CM R, Avó D, LR S, Melo G. Maternal and perinatal aspects of birth defects: a case-control study; 2014.
3. Feldkamp ML, Carey JC, Byrne JLB, Krikov S, Botto LD. Etiology and clinical presentation of birth defects : population based study. BMJ. 2017;357:1–8.
4. OMS. World health statistics 2018: monitoring health for the SDGs, sustainable development goals. Geneva: World Health Organization. 2018;:1–86.
https://www.who.int/gho/publications/world_health_statistics/2018/en/
. Accessed 15 Oct 2019.
5. Ekure EN, Kalu N, Sokunbi OJ, Kruszka P, Olusegun-Joseph AD, Ikebudu D, et al. Clinical epidemiology of congenital heart disease in Nigerian children, 2012-2017. Birth Defects Research. 2018;110:1233–40.