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.
Kvaskoff M, Whiteman DC, Zhao ZZ, Montgomery GW, Martin NG, Hayward NK, Duffy DL.Kvaskoff M, et al. Among authors: duffy dl.Twin Res Hum Genet. 2011 Oct;14(5):422-32. doi: 10.1375/twin.14.5.422.Twin Res Hum Genet. 2011.PMID: 21962134Free PMC article.
Bellamy N, Duffy D, Martin N, Mathews J.Bellamy N, et al.Ann Rheum Dis. 1992 May;51(5):588-93. doi: 10.1136/ard.51.5.588.Ann Rheum Dis. 1992.PMID: 1616321Free PMC article.
Aitken JF, Duffy DL, Green A, Youl P, MacLennan R, Martin NG.Aitken JF, et al. Among authors: duffy dl.Am J Epidemiol. 1994 Dec 1;140(11):961-73. doi: 10.1093/oxfordjournals.aje.a117203.Am J Epidemiol. 1994.PMID: 7985658