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.
Richardson IM, Howie JG, Berkeley JS.Richardson IM, et al. Among authors: berkeley js.J R Coll Gen Pract. 1974 Sep;24(146):661-5.J R Coll Gen Pract. 1974.PMID: 4468984Free PMC article.No abstract available.
Berkeley JS, Richardson IM.Berkeley JS, et al.J R Coll Gen Pract. 1973 Mar;23(128):155-61.J R Coll Gen Pract. 1973.PMID: 4768139Free PMC article.No abstract available.
Richardson IM, Berkeley JS.Richardson IM, et al. Among authors: berkeley js.Br Med J. 1975 Sep 27;3(5986):788. doi: 10.1136/bmj.3.5986.788-a.Br Med J. 1975.PMID: 20792217Free PMC article.No abstract available.