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.
Wong SY, Kung K, Griffiths SM, Carthy T, Wong MC, Lo SV, Chung VC, Goggins WB, Starfield B.Wong SY, et al.BMC Public Health. 2010 Jul 6;10:397. doi: 10.1186/1471-2458-10-397.BMC Public Health. 2010.PMID: 20602806Free PMC article.
Wong MC, Jiang JY, Goggins WB, Liang M, Fang Y, Fung FD, Leung C, Wang HH, Wong GL, Wong VW, Chan HL.Wong MC, et al.Sci Rep. 2017 Mar 31;7:45846. doi: 10.1038/srep45846.Sci Rep. 2017.PMID: 28361988Free PMC article.