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.
Gordon EM, Douglas JG, Ratnoff OD, Arafah BM.Gordon EM, et al. Among authors: ratnoff od.Blood. 1985 Sep;66(3):602-5.Blood. 1985.PMID: 4027381Free article.