Warning: The NCBI web site requires JavaScript to function. more...
An official website of the United States government
The .gov means it's official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.
The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
Date introduced: April 2, 1981
MeSH Unique ID: C028746
Registry Number: TU308VI4JY
Heading Mapped to:
Entry Terms: