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.
Delancey JO, Ashton-Miller JA.Delancey JO, et al.Gastroenterology. 2004 Jan;126(1 Suppl 1):S23-32. doi: 10.1053/j.gastro.2003.10.080.Gastroenterology. 2004.PMID: 14978635Review.