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United States
Nutrition Surveys
High Pressure Liquid Chromatography
Homocysteine
Vitamin A
Folic Acid
Carotenoids
Vitamin E
Iron
Protoporphyrins
Vitamin B 12
Age Factors
Reference Values
Health Surveys
Sex Factors
Infants
Laboratories
Nutritional Status
Quality Control
Erythrocytes
Co-Publications
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