The University of Michigan School of Public Health
Environmental Health Sciences
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The following operators are available : & : AND, | : OR, ! : NOT, as well as levels of parentheses.
Example: "oral & ! doctoral & ( acute | ( occupational & ! university ))" will search for texts containing "oral" but not "doctoral" and either "acute" or "occupational", but "occupational" only if there is no occurence of "university".

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