Serum concentrations of vitamin B12 and folate in British male omnivores, vegetarians and vegans: results from a cross-sectional analysis of the EPIC-Oxford cohort study.
Gilsing, A MJ 1; Crowe, F L 1; Lloyd-Wright, Z 2; Sanders, T AB 2; Appleby, P N 1; Allen, N E 1; Key, T J 1
European Journal of Clinical Nutrition.
64(9):933-939, September 2010.
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