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.
Jordão LMR, Malta DC, Freire MDCM.Jordão LMR, et al.Rev Bras Epidemiol. 2018 Nov 29;21(suppl 1):e180019. doi: 10.1590/1980-549720180019.supl.1.Rev Bras Epidemiol. 2018.PMID: 30517470Free article.English, Portuguese.
Freire Mdo C, Jordao LM, de Paula Ferreira N, de Fatima Nunes M, Queiroz MG, Leles CR.Freire Mdo C, et al.J Dent Educ. 2011 Jan;75(1):115-21.J Dent Educ. 2011.PMID: 21205736