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.
Hefnawy MM, Sultan MA, Al-Johar HI, Kassem MG, Aboul-Enein HY.Hefnawy MM, et al. Among authors: al johar hi.Drug Test Anal. 2012 Jan;4(1):39-47. doi: 10.1002/dta.260. Epub 2011 Mar 18.Drug Test Anal. 2012.PMID: 21416633