O'Boyle, Amy L Pelvic organ support in nulliparous pregnant and nonpregnant women: a case control study. [electronic resource] - American journal of obstetrics and gynecology Jul 2002 - 99-102 p. digital Publication Type: Journal Article ISSN: 0002-9378 Standard No.: 10.1067/mob.2002.125734 doi Subjects--Topical Terms: AdolescentAdultCase-Control StudiesFemaleGenitalia, Female--anatomy & histologyHumansPelvic Floor--anatomy & histologyPregnancyProlapseRetrospective StudiesUterine Prolapse--classification