DOI: 10.1055/s-00000009

American Journal of Perinatology

References

Cnattingius S, Forman MR, Berendes HW, Graubard BI, Isotalo L.
Effect of age, parity, and smoking on pregnancy outcome: a population based study 
Am J Obstet Gynecol 1993; 168: 16-21  

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