Vitamins A, and C and folate status in Mexican children under 12 years and women 12-49 years: a probabilistic national survey Estado de las vitaminas A y C, y folato en niños menor... by Salvador Villalpando, Irene Montalvo-Velarde, Norma Zambrano, Armando García-Guerra, Claudia Ivonne Ramírez-Silva, Teresa Shamah-Levy, Juan A Rivera

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