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.
Edwards J, Zarek JM.Edwards J, et al. Among authors: zarek jm.J R Nav Med Serv. 1977 Spring;63(1):4-8.J R Nav Med Serv. 1977.PMID: 864630No abstract available.