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: August 10, 1990
MeSH Unique ID: C064867
Registry Number: 80X61Y4X0B
Heading Mapped to:
Entry Terms: