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.
Mick R, Ratain MJ.Mick R, et al. Among authors: ratain mj.J Natl Cancer Inst. 1993 Feb 3;85(3):217-23. doi: 10.1093/jnci/85.3.217.J Natl Cancer Inst. 1993.PMID: 8423626