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Vitamin B-12 status during pregnancy and child's IQ at age 8: a Mendelian randomization study in the Avon longitudinal study of parents and children.
Bonilla C, Lawlor DA, Taylor AE, Gunnell DJ, Ben-Shlomo Y, Ness AR, Timpson NJ, St Pourcain B, Ring SM, Emmett PM, Smith AD, Refsum H, Pennell CE, Brion MJ, Smith GD, Lewis SJ. Bonilla C, et al. PLoS One. 2012;7(12):e51084. doi: 10.1371/journal.pone.0051084. Epub 2012 Dec 5. PLoS One. 2012. PMID: 23227234 Free PMC article.