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.
Tefferi A, Pruthi RK.Tefferi A, et al. Among authors: pruthi rk.Mayo Clin Proc. 1994 Feb;69(2):181-6. doi: 10.1016/s0025-6196(12)61046-5.Mayo Clin Proc. 1994.PMID: 8309270Review.