1. Copp, AJ, Stanier, P & Greene, NDE (2013) Neural tube defects: recent advances, unsolved questions, and controversies. Lancet Neurol 12, 799–810.
2. Yi, Y, Lindemann, M, Colligs, A et al. (2011) Economic burden of neural tube defects and impact of prevention with folic acid: a literature review. Eur J Pediatr 170, 1391–1400.
3. Arth, A, Kancherla, V, Pachón, H et al. (2016) A 2015 global update on folic acid-preventable spina bifida and anencephaly. Birth Defects Res Part A Clin Mol Teratol 106, 520–529.
4. Mitchell, LE (2005) Epidemiology of neural tube defects. Am J Med Genet C Semin Med Genet 135C, 88–94.
5. Rasmussen, SA, Chu, SY, Kim, SY et al. (2008) Maternal obesity and risk of neural tube defects: a metaanalysis. Am J Obstet Gynecol 198, 611–619.
6. Soler, NG, Walsh, CH & Malins, JM (1976) Congenital malformations in infants of diabetic mothers. Q J Med 45, 303–313.
7. Moretti, ME, Bar-Oz, B, Fried, S et al. (2005) Maternal hyperthermia and the risk for neural tube defects in offspring: systematic review and meta-analysis. Epidemiology 16, 216–219.
8. Missmer, SA, Suarez, L, Felkner, M et al. (2006) Exposure to fumonisins and the occurrence of neural tube defects along the Texas–Mexico border. Environ Health Perspect 114, 237–241.
9. MRC Vitamin Study Research Group (1991) Prevention of neural tube defects: Results of the Medical Research Council Vitamin Study. Lancet 338, 131–137.
10. Gomes, S, Lopes, C & Pinto, E (2016) Folate and folic acid in the periconceptional period: recommendations from official health organizations in thirty-six countries worldwide and WHO. Public Health Nutr 19, 176–189.
11. Abramsky, L, Botting, B, Chapple, J et al. (1999) Has advice on periconceptional folate supplementation reduced neural-tube defects? Lancet 354, 998–999.
12. Williams, J, Mai, CT, Mulinare, J et al. (2015) Updated estimates of neural tube defects prevented by mandatory folic acid fortification – United States, 1995–2011. MMWR Morb Mortal Wkly Rep 64, 1–5.
13. Atta, CAM, Fiest, KM, Frolkis, AD et al. (2016) Global birth prevalence of spina bifida by folic acid fortification status: a systematic review and meta-analysis. Am J Public Health 106, e24–e34.
14. Hertrampf, E & Cortés, F (2008) National food-fortification program with folic acid in Chile. Food Nutr Bull 29, 2 Suppl., S231–S237.
16. Evans, SE, Mygind, VL, Peddie, MC et al. (2014) Effect of increasing voluntary folic acid food fortification on dietary folate intakes and adequacy of reproductive-age women in New Zealand. Public Health Nutr 17, 1447–1453.
20. World Health Organization & Food and Agriculture Organization of the United Nations (2006) Guidelines on Food Fortification with Micronutrients [L Allen, B de Benoist, O Daryo et al., editors]. Geneva: WHO.
21. Hsiung, DT, Marsit, CJ, Houseman, EA et al. (2007) Global DNA methylation level in whole blood as a biomarker in head and neck squamous cell carcinoma. Cancer Epidemiol Biomarkers Prev 16, 108–114.
22. Morton, SMB, Atatoa Carr, PE, Grant, CCC et al. (2013) Cohort profile: Growing Up in New Zealand. Int J Epidemiol 42, 65–75.
23. Ministry of Health (2006) Food and Nutrition Guidelines for Healthy Pregnant and Breastfeeding Women: A Background Paper. Wellington: Ministry of Health.
24. Morton, S, Grant, CC, Wall, CR et al. (2014) Adherence to nutritional guidelines in pregnancy: evidence from the Growing Up in New Zealand birth cohort study. Public Health Nutr 17, 1919–1929.
25. University of Otago & Ministry of Health (2011) Methodology Report for the 2008/09 New Zealand Adult Nutrition Survey. Wellington: Ministry of Health.
26. Cade, J, Thompson, R, Burley, V et al. (2002) Development, validation and utilisation of food-frequency questionnaires – a review. Public Health Nutr 5, 567–587.
27. Russell, D, Parnell, W, Wilson, N et al. (1999) NZ Food: Food People: Key Results of the 1997 National Nutrition Survey. Wellington: Ministry of Health.
33. Houghton, LA (2014) A country left behind: folic acid food fortification policy in New Zealand. N Z Med J 127, 6–9.
34. US Department of Agriculture, Agricultural Research Service (2011) USDA National Nutrient Database for Standard Reference, release 24. https://ndb.nal.usda.gov/ndb/ .
35. Statistics New Zealand (2009) Final Report of Review of the Official Ethnicity Statistical Standard. Wellington: Statistics New Zealand.
36. World Health Organization (2014) Obesity and Overweight. Fact Sheet no. 311. Geneva: WHO.
37. Brunner Huber, LR (2007) Validity of self-reported height and weight in women of reproductive age. Matern Child Health J 11, 137–144.
38. Bower, C (2003) Fortification of food with folic acid and the prevention of neural tube defects. N Z Med J 116, U292.
39. Mallard, SR, Gray, AR & Houghton, LA (2012) Delaying mandatory folic acid fortification policy perpetuates health inequalities: results from a retrospective study of postpartum New Zealand women. Hum Reprod 27, 273–282.
40. Mallard, SR & Houghton, LA (2012) Folate knowledge and consumer behaviour among pregnant New Zealand women prior to the potential introduction of mandatory fortification. Asia Pac J Clin Nutr 21, 440–449.
41. Marks, R & Potter, JD (2010) New Zealand should have mandatory fortification of bread with folic acid: no. J Prim Health Care 2, 76–78.
42. Morton, S, Grant, C & Carr, P (2013) Too many left at risk by current folic acid supplementation use: evidence from Growing Up in New Zealand. Aust N Z J Public Health 37, 190–191.
43. Oakley, G, Wald, N & Omenn, G (2003) Provide the citizens of New Zealand the miracle of folic acid fortification. N Z Med J 116, U302.
44. Oakley, GGP, Weber, MB, Bell, KN et al. (2004) Scientific evidence supporting folic acid fortification of flour in Australia and New Zealand. Birth Defects Res Part A Clin Mol Teratol 70, 838–841.
45. Mann, J & Green, T (2002) Hyperhomocysteinaemia: time to screen and treat? N Z Med J 115, U197.
46. Skeaff, M, Green, T & Mann, J (2003) Mandatory fortification of flour? Science, not miracles, should inform the decision. N Z Med J 116, U303.
47. Dalziel, K, Segal, L & Katz, R (2010) Cost-effectiveness of mandatory folate fortification v. other options for the prevention of neural tube defects: results from Australia and New Zealand. Public Health Nutr 13, 566–578.
48. Barua, S, Kuizon, S & Junaid, MA (2014) Folic acid supplementation in pregnancy and implications in health and disease. J Biomed Sci 21, 77.
49. Craig, E, McDonald, G, Adams, J et al. (2012) Te Ohonge Ake: The Health of Maori Children and Young People with Chronic Conditions and Disabilities in New Zealand. Dunedin: New Zealand Child and Youth Epidemiology Service, University of Otago; https://ourarchive.otago.ac.nz/handle/10523/6133
51. Teixeira, JA, Castro, TG, Wall, CR et al. (2018) Determinants of folic acid supplement use outside national recommendations for pregnant women: results from the Growing Up in New Zealand cohort study. Public Health Nutr 21, 2183–2192.
52. Cornel, MC, Smit, DJ de & de Jong-van den Berg, LTW (2005) Folic acid – the scientific debate as a base for public health policy. Reprod Toxicol 20, 411–415.
53. Ionescu-Ittu, R, Marelli, AJ, Mackie, AS et al. (2009) Prevalence of severe congenital heart disease after folic acid fortification of grain products: time trend analysis in Quebec, Canada. BMJ 338, b1673.
54. Bentley, TG, Weinstein, MC, Willett, WC et al. (2009) A cost-effectiveness analysis of folic acid fortification policy in the United States. Public Health Nutr 12, 455–467.
55. Vollset, SE, Clarke, R, Lewington, S et al. (2013) Effects of folic acid supplementation on overall and site-specific cancer incidence during the randomised trials: meta-analyses of data on 50,000 individuals. Lancet 381, 1029–1036.
57. Mallard, SR, Gray, AR & Houghton, LA (2012) Periconceptional bread intakes indicate New Zealand’s proposed mandatory folic acid fortification program may be outdated: results from a postpartum survey. BMC Pregnancy Childbirth 12, 8.
58. Smith, C, Gray, AR, Mainvil, LA et al. (2015) Secular changes in intakes of foods among New Zealand adults from 1997 to 2008/09. Public Health Nutr 18, 3249–3259.
59. Lawrence, M (2005) Assessing the case for mandatory folate fortification: policy-making in the face of scientific uncertainties. Aust N Z J Public Health 29, 328–330.
60. Green, T, Newton, R & Bourn, D (2003) Estimated folic acid intakes from simulated fortification of the New Zealand food supply. N Z Med J 116, U294.
61. World Health Organization (2016) WHO Guideline: Fortification of Maize Flour and Corn Meal with Vitamins and Minerals. Geneva: WHO.
62. Lawrence, M (2005) Challenges in translating scientific evidence into mandatory food fortification policy: an antipodean case study of the folate–neural tube defect relationship. Public Health Nutr 8, 1235–1241.
63. Lawrence, M & Riddell, L (2007) Mandatory fortification with folic acid – what would Hippocrates say? Aust Fam Physician 36, 69–70, .
65. Cole, BF, Baron, JA, Sandler, RS et al. (2007) Folic acid for the prevention of colorectal adenomas: a randomized clinical trial. JAMA 297, 2351–2359.
66. Bradbury, KE, Williams, SM, Mann, JI et al. (2016) Serum and erythrocyte folate status of New Zealand women of childbearing age following a countrywide voluntary programme by the baking industry to fortify bread with folic acid. Public Health Nutr 19, 2897–2905.
67. Morton, SSMB, Ramke, J, Kinloch, J et al. (2015) Growing Up in New Zealand cohort alignment with all New Zealand births. Aust N Z J Public Health 39, 82–87.
68. Sivakumaran, SS, Huffman, L & Sivakumaran, SS (2016) The New Zealand Food Composition Database: a useful tool for assessing New Zealanders’ nutrient intake. Food Chem 238, 101–110.