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.
Szejnfeld VL, Souen JS, Baracat EC, Atra E, de Lima GR.Szejnfeld VL, et al.Sao Paulo Med J. 1994 Jan-Mar;112(1):517-21. doi: 10.1590/s1516-31801994000100009.Sao Paulo Med J. 1994.PMID: 7871318
da Silva HC, Szejnfeld VL, Assis LS, Sato EI.da Silva HC, et al. Among authors: szejnfeld vl.Rev Assoc Med Bras (1992). 1997 Jan-Mar;43(1):40-6.Rev Assoc Med Bras (1992). 1997.PMID: 9224991Portuguese.