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Landmarks during the first forty-two days of gestation demonstrated by the β-subunit of human chorionic gonadotropin and ultrasound

Developmental BiologyFertilityHuman Chorionic GonadotropinReproductive HealthGynecologyFirst Forty-two DaysHuman Embryonic DevelopmentReproductive BiologyPublic HealthEndocrinologyMedicineReproductive PhysiologyReproductive Endocrinology