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.
Quinn N, Daniel S, Magalhães-Branco M, Lees A, Hughes A.Quinn N, et al.Lancet. 1992 Jul 11;340(8811):125. doi: 10.1016/0140-6736(92)90456-d.Lancet. 1992.PMID: 1352003No abstract available.