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.
Lawrenson J, Chapman P, Geffen L, Simpson J, Keen G.Lawrenson J, et al.S Afr Med J. 1991 May 18;79(10):625-6.S Afr Med J. 1991.PMID: 2028360No abstract available.
Naudé W Du T, Klein M, Keen GA, Kipps A.Naudé W Du T, et al. Among authors: keen ga.S Afr Med J. 1974 Dec 14;48(61):2543-5.S Afr Med J. 1974.PMID: 4375860No abstract available.
Tucker TJ, Keen GA, Yeats J, Hardie D.Tucker TJ, et al. Among authors: keen ga.S Afr Med J. 1997 Oct;87(10):1386-7; author reply 1388.S Afr Med J. 1997.PMID: 9472256No abstract available.
Keen GA, Murray A, Smuts H, Becker M, Berger RR, Roome D.Keen GA, et al.S Afr Med J. 1993 Feb;83(2):132-3.S Afr Med J. 1993.PMID: 8451692No abstract available.