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.
Zhao Y, Dupre ME, Qiu L, Gu D.Zhao Y, et al. Among authors: qiu l.BMC Public Health. 2017 Jun 9;17(1):561. doi: 10.1186/s12889-017-4479-1.BMC Public Health. 2017.PMID: 28599631Free PMC article.
Zhao Y, Fu H, Guo A, Qiu L, Cheung KSL, Wu B, Jopp D, Gu D.Zhao Y, et al. Among authors: qiu l.BMC Geriatr. 2018 Oct 22;18(1):251. doi: 10.1186/s12877-018-0944-7.BMC Geriatr. 2018.PMID: 30348092Free PMC article.