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Medical Subject Headings

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Combining (AND, OR)

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COMBINING (AND, OR)
Screen 2 of 4

OR

Either one or all of the selected terms may appear in the retrieved citations. OR is used to include similar terms or concepts, or to group synonyms or like-terms.

This will increase the number of citations to review by linking synonyms together into one big group.

OR EXAMPLES

Acquired immunodeficiency syndrome
OR AIDS OR HIV

pregnancy, first trimester OR pregnancy, second trimester

myocardial infarction OR heart attack