1. World Health Organization (2016). WHO recommendations on antenatal care for a positive pregnancy experience. Retrieved from http://apps.who.int/iris/bitstream/handle/10665/250796/9789241549912-eng.pdf?sequence=1. Geneva, Switzerland.
2. Wald NJ, Morris JK and Blakemore C. Public health failure in the prevention of neural tube defects: time to abandon the tolerable upper intake level of folate. Public Health Reviews. 2018: 39:2
3. Bestwick JP, Huttly WJ, Morris JK, Wald NJ. Prevention of neural tube defects: a cross-sectional study of the uptake of folic acid supplementation in nearly half a million women. PLoS One. 2014; 9(2): e89354
4. Balk EM, Adam GP, Langberg VN, Earley A, Clark P, et al. Global Dietary calcium intake among adults: a systemic review. Osteoporosis International. 2017 Oct; 28 (12): 3315-3324
5.Middleton P, Gomersall JC, Gould JF, et al. Omega-3 fatty acid addition during pregnancy. Cochrane Database Systemic Review. 2018 Nov 15;11: CD003402