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. by Carolina Bonilla, Debbie A Lawlor, Amy E Taylor, David J Gunnell, Yoav Ben-Shlomo, Andrew R Ness, Nicholas J Timpson, Beate St Pourcain, Susan M Ring, Pauline M Emmett, A David Smith, Helga Refsum, Craig E Pennell, Marie-Jo Brion, George Davey Smith, Sarah J Lewis

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