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.
Kingham JG, Levison DA, Ball JA, Dawson AM.Kingham JG, et al. Among authors: levison da.Br Med J (Clin Res Ed). 1982 Dec 4;285(6355):1601-4. doi: 10.1136/bmj.285.6355.1601.Br Med J (Clin Res Ed). 1982.PMID: 6128051Free PMC article.
Swarbrick ET, Fairclough PD, Campbell PJ, Levison DA, Greenwood RH, Baker LR.Swarbrick ET, et al. Among authors: levison da.Lancet. 1980 Nov 15;2(8203):1084-5. doi: 10.1016/s0140-6736(80)92309-0.Lancet. 1980.PMID: 6107712No abstract available.
Shepherd NA, Hall PA, Williams GT, Codling BW, Jones EL, Levison DA, Morson BC.Shepherd NA, et al. Among authors: levison da.Histopathology. 1989 Oct;15(4):325-37. doi: 10.1111/j.1365-2559.1989.tb01585.x.Histopathology. 1989.PMID: 2680870Review.