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.
Sonnenberg A, Olson CA, Zhang J.Sonnenberg A, et al.Am J Gastroenterol. 1999 Apr;94(4):950-4. doi: 10.1111/j.1572-0241.1999.992_o.x.Am J Gastroenterol. 1999.PMID: 10201462Clinical Trial.