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.
Wigfall L, Duffus WA, Annang L, Richter DL, Torres ME, Williams EM, Glover SH.Wigfall L, et al.J S C Med Assoc. 2009 Dec;105(7):274-80.J S C Med Assoc. 2009.PMID: 20108718Free PMC article.
Wigfall LT, Williams EM, Sebastian N, Glover SH.Wigfall LT, et al.J Natl Med Assoc. 2010 Dec;102(12):1150-7. doi: 10.1016/s0027-9684(15)30769-0.J Natl Med Assoc. 2010.PMID: 21287895