Anheier, T. “Neural Tube Defects in Switzerland from 2001 to 2007: Are Periconceptual Folic Acid Recommendations Being Followed?”. Swiss Medical Weekly 138, no. 4142 (October 18, 2008): 608–613. Accessed May 14, 2024. https://smw.ch/index.php/smw/article/view/904.