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The 19-Bp Deletion Polymorphism of Dihydrofolate Reductase (DHFR) and Nonsyndromic Cleft Lip With or Without Cleft Palate: Evidence for a Protective Role . J Appl Oral Sci 2015, 23 (3), 272-278. https://doi.org/10.1590/1678-775720140473.