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The international rates of triplet or higher order pregnancies after assisted reproduction are 7.3% at conception, 6.5% before reduction and 3.85% at birth. The obstetric and neonatal outcomes for twins and triplets show that reducing the proportion of multiple pregnancies should be a goal for centres undertaking in-vitro fertilization (IVF) and embryo transfer.
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J. Cohen (1998) studied this question.
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