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Kennedy D. B Vitamins and the Brain: Mechanisms, Dose and Efficacy—A Review. Nutrients. 2016 Feb; 8(2): 68.
Aring C, Spies T. Vitamin B Deficiency and Nervous Disease. J Neuro Psychiatry: first published as 10.1136/jnnp.2.4.335 on 1 October 1939.
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