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.
Chen H, Zheng X, Cooks RG.Chen H, et al.J Am Soc Mass Spectrom. 2003 Mar;14(3):182-8. doi: 10.1016/S1044-0305(02)00904-2.J Am Soc Mass Spectrom. 2003.PMID: 12648924Free article.
Chen H, Chen H, Cooks RG.Chen H, et al.J Am Soc Mass Spectrom. 2004 Jul;15(7):998-1004. doi: 10.1016/j.jasms.2004.03.006.J Am Soc Mass Spectrom. 2004.PMID: 15234359Free article.
Chen H, Cooks RG, Meurer EC, Eberlin MN.Chen H, et al.J Am Soc Mass Spectrom. 2005 Dec;16(12):2045-51. doi: 10.1016/j.jasms.2005.08.012. Epub 2005 Oct 24.J Am Soc Mass Spectrom. 2005.PMID: 16246573Free article.