| http://www.w3.org/ns/prov#value | - The researchers found that most people in the United States had good levels of vitamin D and A; however, vitamin D levels were found to be inadequate in some groups, most notably in non-Hispanic blacks, 31 percent of whom were deficient in vitamin D. In addition, Mexican-American children aged 1 to 5 and Mexican-American and non-Hispanic black women of childbearing age had higher rates of iron def
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