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The predictive value of hCG β subunit levels in pregnancies achieved by in vitro fertilization and embryo transfer: an international collaborative study

International Collaborative StudyDevelopmental BiologyFertilityReproductive HealthGynecologyMaternal HealthPredictive ValueReproductive MedicineEmbryonic DevelopmentEmbryo TransferReproductive BiologyPublic HealthMedicineEmbryologyHuman ReproductionReproductive Biotechnology