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Centers for Disease Control and Prevention
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birth defect*retrieval set includes coverage of birth defect or birth defects
birth defects and folic acidretrieval set includes content covering birth defects and folic acid in the same document
birth defects or folic acidretrieval set includes either content covering birth defects or content covering folic acid
birth defects not folic acidretrieval set includes content that covers birth defects where folic acid is not covered in the document
(neural tube defects or birth defects) and folic acidretrieval set includes content where either neural tube defects or birth defects is covered and prevention with folic acid is covered in all content
"neural tube"retrieval set includes content where the exact phrase neural tube appears in the document