PMID: 9774309 [PubMed - indexed for MEDLINE]
PMCID: PMC1114078
Br J Obstet Gynaecol. 1992 May; 99(5):357-8.
[Br J Obstet Gynaecol. 1992]
J Fam Plann Reprod Health Care. 2005 Oct; 31(4):313-4.
[J Fam Plann Reprod Health Care. 2005]
Am J Obstet Gynecol. 1998 Aug; 179(2):397-8.
[Am J Obstet Gynecol. 1998]
Ned Tijdschr Geneeskd. 2008 Jan 5; 152(1):20-4.
[Ned Tijdschr Geneeskd. 2008]
Obstet Gynecol Surv. 2007 May; 62(5):335-47; quiz 353-4.
[Obstet Gynecol Surv. 2007]
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