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.
Roy D, Snodgrass WR.Roy D, et al. Among authors: snodgrass wr.Ther Drug Monit. 1989;11(1):57-62. doi: 10.1097/00007691-198901000-00012.Ther Drug Monit. 1989.PMID: 2911855