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.
Walkley SU, Dobrenis K.Walkley SU, et al.Lancet. 1995 Jun 3;345(8962):1382-3. doi: 10.1016/s0140-6736(95)92590-2.Lancet. 1995.PMID: 7760604No abstract available.