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.
Khamashta M, Hughes GR.Khamashta M, et al.BMJ. 1993 Oct 9;307(6909):883-4. doi: 10.1136/bmj.307.6909.883.BMJ. 1993.PMID: 8241846Free PMC article.No abstract available.