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.
Oubrahim H, Richard JM, Cantin-Esnault D, Seigle-Murandi F, Trécourt F.Oubrahim H, et al.J Chromatogr A. 1997 Jan 10;758(1):145-57. doi: 10.1016/s0021-9673(96)00695-4.J Chromatogr A. 1997.PMID: 9181972