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.
Tomlinson DR, French PD, Harris JR, Mercey DE.Tomlinson DR, et al. Among authors: french pd.Lancet. 1991 Feb 23;337(8739):501-2. doi: 10.1016/0140-6736(91)93447-h.Lancet. 1991.PMID: 1671511Clinical Trial.No abstract available.