[1]https://www.dzne.de/ueber-uns/presse/meldungen/2017/pressemitteilung-nr-6.html
[2]http://www.nature.com/mp/journal/vaop/ncurrent/full/mp201753a.html
[3]Bird A. The essentials of DNA methylation. Cell 1992; 70: 5–8.
[4]Niculescu MD, Zeisel SH. Diet, methyl donors and DNA methylation: interactions between dietary folate, methionine and choline. J Nutr 2002; 132: 2333S–2335S.
[5]Smithells RW, Sheppard S, Schorah CJ. Vitamin deficiencies and neural tube defects. Arch Dis Child 1976; 51: 944–950.
[6]Crider KS, Bailey LB, Berry RJ. Folic acid food fortification-its history, effect, concerns, and future directions. Nutrients 2011; 3: 370–384.
[7]Smith AD, Kim YI, Refsum H. Is folic acid good for everyone? Am J Clin Nutr 2008; 87: 517–533.