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  • Title: Monozygotic twinning is not associated with zona pellucida micromanipulation procedures but increases with high-order multiple pregnancies.
    Author: Elizur SE, Levron J, Shrim A, Sivan E, Dor J, Shulman A.
    Journal: Fertil Steril; 2004 Aug; 82(2):500-1. PubMed ID: 15302315.
    Abstract:
    Between January 1, 1995 and December 31, 2001, 5,310 cycles were performed in the IVF Unit, Sheba Medical Center, Israel, resulting in 1,066 clinical pregnancies. There was no difference in the rate of pregnancies containing monozygotic twins after zona pellucida micromanipulation procedures (0.9%) compared to conventional insemination (1.0%) (6/677 vs. 4/389).
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