DOI: 10.1055/s-00000142

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References

Ananth CV, Demissie K, Smulian JC. et al
Placenta previa in singelton and twin births in the United States, 1989 through 1998: A comparison of risk factor profiles and associated conditions. 
Am J Obstet Gynecol 2003; 188: 275-281  

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