1. Czeizel AE, Dudas I. Prevention of the first occurrence of neural-tube defects by Periconceptional vitamin supplementation. New Eng J med 1992:327: 1832-5
2. Czeizel AE, Dudas I, Fritz G, Tecsoi A, Hanck A, Kunovits G. The effect of periconceptional multivitamin supplementation on vertigo, nausea and vomiting in the first trimester of pregnancy. Archieves of Gynecology and Obstetrics 1992;251;181 – 185.
5. Melbourne: Therapeutic Guidelines Limited; 2011.
6. Czeizel A.E. Primary prevention of neural-tube defects and some other major congenital abnormalities: recommendations for the appropriate use of folic acid during pregnancy. Paediatr Drugs. 2000 Nov-Dec;2(6):437-49.