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.
Yehia HM, Al-Olayan EM, El-Khadragy MF, Metwally DM.Yehia HM, et al.Int J Environ Res Public Health. 2017 Jul 13;14(7):777. doi: 10.3390/ijerph14070777.Int J Environ Res Public Health. 2017.PMID: 28703780Free PMC article.
Olayan E, El-Khadragy M, Mohamed AF, Mohamed AK, Shebl RI, Yehia HM.Olayan E, et al.Biomed Res Int. 2019 Mar 17;2019:4518163. doi: 10.1155/2019/4518163. eCollection 2019.Biomed Res Int. 2019.PMID: 31008105Free PMC article.