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Methylenetetrahydrofolate Reductase (NADPH2)
Homocysteine
Folic Acid
Methylmalonic Acid
Reduced Folate Carrier Protein
Brazil
Case Control Studies
Polymerase Chain Reaction
Genotype
Genetic Predisposition to Disease
Head and Neck Neoplasms
Down's Syndrome
Squamous Cell Carcinoma
Gene Frequency
Risk Factors
Cross-Sectional Studies
Alleles
Single Nucleotide Polymorphism
Smoking
Infants
Co-Publications
33
13
9
7
6
5
4
3
2
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