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.
Kikura M, Sato S.Kikura M, et al.Anesth Analg. 2002 Jan;94(1):22-30, table of contents. doi: 10.1097/00000539-200201000-00005.Anesth Analg. 2002.PMID: 11772795Clinical Trial.