PMID: 14349190 [PubMed - indexed for MEDLINE]
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[Ultrasound Obstet Gynecol. 2004]
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[Obstet Gynecol. 2005]
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[Obstet Gynecol. 2006]
J Obstet Gynecol Neonatal Nurs. 2007 Mar-Apr; 36(2):135-43.
[J Obstet Gynecol Neonatal Nurs. 2007]
Obstet Gynecol Clin North Am. 2005 Jun; 32(2):165-79.
[Obstet Gynecol Clin North Am. 2005]
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