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.
Mulla ZD, Leaverton PE, Wiersma ST.Mulla ZD, et al. Among authors: leaverton pe.South Med J. 2003 Oct;96(10):968-73. doi: 10.1097/01.SMJ.0000051060.95210.9A.South Med J. 2003.PMID: 14570340
Bayona M, Leaverton PE, Rangel-Sharpless MC, Williams PD.Bayona M, et al. Among authors: leaverton pe.Public Health Rep. 1994 May-Jun;109(3):434-8.Public Health Rep. 1994.PMID: 8190868Free PMC article.