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.
Hopkin DA.Hopkin DA.Br Med J (Clin Res Ed). 1986 Oct 4;293(6551):886. doi: 10.1136/bmj.293.6551.886-b.Br Med J (Clin Res Ed). 1986.PMID: 3094703Free PMC article.No abstract available.
Hopkin DA.Hopkin DA.Br Med J (Clin Res Ed). 1982 Jun 26;284(6333):1952-3. doi: 10.1136/bmj.284.6333.1952-d.Br Med J (Clin Res Ed). 1982.PMID: 6805783Free PMC article.No abstract available.
Hopkin DA.Hopkin DA.Br Med J. 1980 Jul 5;281(6232):62. doi: 10.1136/bmj.281.6232.62-b.Br Med J. 1980.PMID: 7407504Free PMC article.No abstract available.
Hopkin DA.Hopkin DA.Br Med J. 1978 Sep 16;2(6140):830-1. doi: 10.1136/bmj.2.6140.830-b.Br Med J. 1978.PMID: 698754Free PMC article.No abstract available.