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Vaccine 41, 47524761
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Br J Clin Pharmacol 63 : 6774 Lucock MD, Daskalakis I, Schorah CJ, Lumb CH, Oliver M, Devitt H, Wild J, Dowell AC, Levene MI (1999) Folatehomocysteine interrelations: potential new markers of folate status

Another significant cause is poor absorption due to a disease process which affects the stomach or intestines
