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Metformin Use and Vitamin B12 deficiency—Untangling the AssociationRodríguez-Gutiérrez, René; Montes-Villarreal, Juan; Rodríguez-Velver, Karla Victoria; González-Velázquez, Camilo; Salcido-Montenegro, Alejandro; Elizondo-Plazas, Anasofia; González-González, José Gerardo · The American Journal of the Medical Sciences · 2017