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.
Liu R, Li Y, Wang F, Liu X, Zhou H, Wang P, Fan J, Xu F, Yang K, Hu D, Bie R, Wang C.Liu R, et al. Among authors: xu f.Sleep Med. 2017 May;33:119-124. doi: 10.1016/j.sleep.2016.09.004. Epub 2016 Oct 29.Sleep Med. 2017.PMID: 28449890
Zhou H, Li Y, Liu X, Xu F, Li L, Yang K, Qian X, Liu R, Bie R, Wang C.Zhou H, et al. Among authors: xu f.Sci Rep. 2017 Feb 17;7:42685. doi: 10.1038/srep42685.Sci Rep. 2017.PMID: 28209984Free PMC article.
Sun C, Xu F, Liu X, Fang M, Zhou H, Lian Y, Xie C, Sun N, Wang C.Sun C, et al. Among authors: xu f.Sci Rep. 2017 Mar 24;7:43227. doi: 10.1038/srep43227.Sci Rep. 2017.PMID: 28337999Free PMC article.
Xu F, Zhu J, Sun N, Wang L, Xie C, Tang Q, Mao X, Fu X, Brickell A, Hao Y, Sun C.Xu F, et al.J Glob Health. 2019 Dec;9(2):020601. doi: 10.7189/jogh.09.020601.J Glob Health. 2019.PMID: 31788232Free PMC article.
Sun C, Liu H, Xu F, Qin Y, Wang P, Zhou Q, Liu D, Jia S, Zhang Q.Sun C, et al. Among authors: xu f.BMC Geriatr. 2022 Jun 1;22(1):474. doi: 10.1186/s12877-022-03017-3.BMC Geriatr. 2022.PMID: 35650518Free PMC article.