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.
Bhattacharya S, Porter M, Harrild K, Naji A, Mollison J, van Teijlingen E, Campbell DM, Hall MH, Templeton A.Bhattacharya S, et al. Among authors: campbell dm.BJOG. 2006 Mar;113(3):268-75. doi: 10.1111/j.1471-0528.2006.00853.x.BJOG. 2006.PMID: 16487197
Martin CL, Hall MH, Campbell DM.Martin CL, et al. Among authors: campbell dm.BJOG. 2000 Jun;107(6):745-9. doi: 10.1111/j.1471-0528.2000.tb13335.x.BJOG. 2000.PMID: 10847230
Bell JS, Campbell DM, Graham WJ, Penney GC, Ryan M, Hall MH.Bell JS, et al. Among authors: campbell dm.BJOG. 2001 Sep;108(9):910-8. doi: 10.1111/j.1471-0528.2001.00214.x.BJOG. 2001.PMID: 11563459
Bell JS, Campbell DM, Graham WJ, Penney GC, Ryan M, Hall MH.Bell JS, et al. Among authors: campbell dm.BMJ. 2001 Apr 14;322(7291):894-5. doi: 10.1136/bmj.322.7291.894.BMJ. 2001.PMID: 11302901Free PMC article.No abstract available.