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  • Enter keywords or phrases in quotes.
  • Protocol search: use format NIDA-CTN-0001 (e.g.)
  • Within a search box, you can use these operators:
    AND to require multiple terms (e.g. “opioids AND youth”)
    OR to require any of the terms (e.g. “cannabis OR marijuana”)
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    * to truncate (e.g. “teen*” to find teen, teenage, teenager, etc.)
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