Click to view search tips
- 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”)
NOT to exclude terms (e.g. “stimulants NOT opioids”)
* to truncate (e.g. “teen*” to find teen, teenage, teenager, etc.)
- For searching years:
< 2015 (items before 2015)
> 2015 (items after 2015)
= 2015 (items in 2015)
2000:2020 (items btn 2000-2020)