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.
Qian M, O'Dwyer PJ, Gallo JM.Qian M, et al.J Chromatogr B Biomed Appl. 1995 Apr 21;666(2):307-14. doi: 10.1016/0378-4347(94)00589-w.J Chromatogr B Biomed Appl. 1995.PMID: 7633607Clinical Trial.