1. American College of Medical Genetics and Genomics. Technicalstandards and guidelines. 2008 edition with upgrades through March 2007. https://www.acmg.net/ACMG/Medical-Genetics-Practice-Resources/Technical_Standards_and_Guidelines.aspx?WebsiteKey=6e814a8c-3077-4552-ba39-f7fcacff42d6. Accessed 1 October 2019.
2. Technical standards and guidelines: prenatal screening for open neural tube defects;ACMG Laboratory Quality Assurance Committee.;Genet Med,2005
3. United States Food and Drug Administration. Code of FederalRegulations Title 21. 2015. https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/cfrsearch.cfm?fr=101.79. Accessed 1 October 2019.
4. Folic acid food fortification—its history, effect, concerns, and future directions;Crider;Nutrients,2011
5. Updated estimates of neural tube defects prevented by mandatory folic acid fortification—United States, 1995-2011;Williams;MMWR Morb Mortal Wkly Rep,2015