1. Trends in the postfortification prevalence of spina bifida and anencephaly in the United States;Boulet;Birth Defects Res. Part A Clin. Mol. Teratol.,2008
2. English Indices of deprivation 2015;Dept of Communities and Local Government,2015
3. Folic acid and human reproduction—ten important issues for clinicians;Dunlap;J. Exp. Clin. Assist. Reprod.,2011
4. EUROCAT Prevalence Tables 2000-2014;EUROCAT,2016
5. EUROCAT Syndrome Guide: Definition and Coding of Syndromes;European Surveillance of Congenital Anomalies,2008