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.
Chan AKY, Tamrakar M, Jiang CM, Lo ECM, Leung KCM, Chu CH.Chan AKY, et al. Among authors: chu ch.Int J Environ Res Public Health. 2021 Oct 12;18(20):10662. doi: 10.3390/ijerph182010662.Int J Environ Res Public Health. 2021.PMID: 34682414Free PMC article.Review.
Chu CH, Wong AW, Lo EC, Courtel F.Chu CH, et al.Int Dent J. 2008 Feb;58(1):15-22. doi: 10.1111/j.1875-595x.2008.tb00172.x.Int Dent J. 2008.PMID: 18350849