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To evaluate whether vanishing twin (VT) pregnancies achieved by in vitro fertilization and intracytoplasmic sperm injection (IVF–ICSI) had a more adverse perinatal outcome than those after natural conception.Longitudinal, retrospective cohort study.Tertiary university hospital.Three hundred and six (78 after IVF–ICSI and 228 after natural conception) VT pregnancies over a 22-year period, with VT cases...
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