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Bell JS, Campbell DM, Graham WJ, Penney GC, Ryan M, Hall MH.Bell JS, et al. Among authors: penney gc.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: penney gc.BMJ. 2001 Apr 14;322(7291):894-5. doi: 10.1136/bmj.322.7291.894.BMJ. 2001.PMID: 11302901Free PMC article.No abstract available.
Hundley V, Rennie AM, Fitzmaurice A, Graham W, van Teijlingen E, Penney G.Hundley V, et al.Midwifery. 2000 Dec;16(4):303-13. doi: 10.1054/midw.2000.0231.Midwifery. 2000.PMID: 11080466
Hundley V, Penney G, Fitzmaurice A, van Teijlingen E, Graham W.Hundley V, et al.Midwifery. 2002 Jun;18(2):126-35. doi: 10.1054/midw.2002.0306.Midwifery. 2002.PMID: 12139910
Graham W, Wagaarachchi P, Penney G, McCaw-Binns A, Antwi KY, Hall MH.Graham W, et al.Bull World Health Organ. 2000;78(5):614-20.Bull World Health Organ. 2000.PMID: 10859855Free PMC article.Review.