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.
Ryan CM, Sheridan RL, Schoenfeld DA, Warshaw AL, Tompkins RG.Ryan CM, et al. Among authors: sheridan rl.Ann Surg. 1995 Aug;222(2):163-70. doi: 10.1097/00000658-199508000-00008.Ann Surg. 1995.PMID: 7543741Free PMC article.