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Kapp N
,Borgatta L
,Stubblefield P
,Vragovic O
,Moreno N
Obstetrics & Gynecology, Dec 2007 ...read moreStrauss LT
,Gamble SB
,Parker WY
,Cook DA
,Zane SB
,Hamdan S
,Centers for Disease Control and Prevention (CDC)
Morbidity and Mortality Weekly Report: Surveillance Summaries, Nov 2007 ...read more