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 S, Page A, Yin P, Astell-Burt T, Feng X, Liu Y, Liu J, Wang L, Zhou M.Liu S, et al.Psychol Med. 2015 Nov;45(15):3259-68. doi: 10.1017/S0033291715001269. Epub 2015 Jul 3.Psychol Med. 2015.PMID: 26138093
Meyerowitz-Katz G, Ravi S, Arnolda L, Feng X, Maberly G, Astell-Burt T.Meyerowitz-Katz G, et al.J Med Internet Res. 2020 Sep 29;22(9):e20283. doi: 10.2196/20283.J Med Internet Res. 2020.PMID: 32990635Free PMC article.