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Moris, Gladys Ojeda; Tardón, Yocelyn López; Navarrete, Marcela Díaz; Rauco, Mariana Rojas; Rauco, Mariana Rojas (Universidad de la Frontera, 2014)© 2014, Postgraduate Medical Institute. All rights reserved. The deficit and excess of vitamin A causes birth defects affecting different organ systems. The objectives of this study are to determine the effect caused by ...