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.
Jenkins SA, Baxter JN, Critchley M, Kingsnorth AN, Makin CA, Ellenbogen S, Grime JS, Love JG, Sutton R.Jenkins SA, et al. Among authors: critchley m.BMJ. 1997 Nov 22;315(7119):1338-41. doi: 10.1136/bmj.315.7119.1338.BMJ. 1997.PMID: 9402774Free PMC article.Clinical Trial.
Nicholson T, Stockdale HR, Critchley M, Grime JS, Jones RS, Maltby P.Nicholson T, et al. Among authors: critchley m.Res Vet Sci. 1997 Jan-Feb;62(1):26-9. doi: 10.1016/s0034-5288(97)90175-2.Res Vet Sci. 1997.PMID: 9160420