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.
Coburn JA, Chau AS.Coburn JA, et al. Among authors: chau as.Environ Lett. 1975;10(3):225-36. doi: 10.1080/00139307509435824.Environ Lett. 1975.PMID: 55360
Lee HB, Weng LD, Chau AS.Lee HB, et al. Among authors: chau as.J Assoc Off Anal Chem. 1984 Nov-Dec;67(6):1086-91.J Assoc Off Anal Chem. 1984.PMID: 6520080
Lee HB, Weng LD, Chau AS.Lee HB, et al. Among authors: chau as.J Assoc Off Anal Chem. 1984 Jul-Aug;67(4):789-94.J Assoc Off Anal Chem. 1984.PMID: 6469913