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.
Chen YX, Ge J, Yan M, Jin CJ, Zhang MX, Dong FT, Lu F, Zhang CF, Zhao JL.Chen YX, et al.Zhonghua Yan Ke Za Zhi. 2007 Mar;43(3):198-205.Zhonghua Yan Ke Za Zhi. 2007.PMID: 17605900Clinical Trial.Chinese.
Luo M, Chen Y.Luo M, et al.Int J Ophthalmol. 2018 Jan 18;11(1):150-159. doi: 10.18240/ijo.2018.01.23. eCollection 2018.Int J Ophthalmol. 2018.PMID: 29376004Free PMC article.Review.
Yang J, Yuan M, Wang E, Chen Y.Yang J, et al.J Ophthalmol. 2019 Nov 23;2019:4372580. doi: 10.1155/2019/4372580. eCollection 2019.J Ophthalmol. 2019.PMID: 31871782Free PMC article.