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Work cat.: (OSt)13903: Institute of Medicine (Estados Unidos). Food and Nutrition Board, ., Dietary reference intakes for thiamin, riboflavin, niacin, vitamina B6, folate, vitamina B12, pantothenic acid, biotin, and choline: a report of the Standing Committee on the Scientific Evaluation of Dietary Reference Intakes and its Panel on Folate, Othe., 1998.