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: January 1, 1974
MeSH Unique ID: C007759
Registry Number: 6N5Y3AHS7P
Heading Mapped to:
Entry Terms:
Previous Indexing: