Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Dropdown bars displaying the category and scope filters within PubMed's Clinical Queries tool are shown. Narrow searches deliver clinical trials, randomized controlled trials, and systematic reviews. Broad searches deliver similar research with the inclusion of other review articles.
