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.
Lam CS, Yu BY, Cheung DST, Cheung T, Lam SC, Chung KF, Ho FY, Yeung WF.Lam CS, et al. Among authors: chung kf.Int J Environ Res Public Health. 2021 Aug 10;18(16):8444. doi: 10.3390/ijerph18168444.Int J Environ Res Public Health. 2021.PMID: 34444192Free PMC article.
Yeung WF, Chung KF, Poon MM, Ho FY, Zhang SP, Zhang ZJ, Ziea ET, Wong VT.Yeung WF, et al. Among authors: chung kf.Sleep Med Rev. 2012 Dec;16(6):497-507. doi: 10.1016/j.smrv.2011.12.005. Epub 2012 Mar 21.Sleep Med Rev. 2012.PMID: 22440393Review.