Yolk sac number does not predict reliably amnionicity in monochorionic twin pregnancies: a case of a monochorionic monoamniotic twin pregnancy with two distinct yolk sacs on early first‐trimester ultrasound - Corbett -
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JKMS :: Journal of Korean Medical Science
Twin pregnancy at 4 weeks: Symptoms, baby size & fetal development | BabyCenter
Successful pregnancy following medical management of heterotopic pregnancy. - Abstract - Europe PMC
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Sonogram: Twins at 5 weeks! - YouTube
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Early pregnancy ultrasound measurements and prediction of first trimester pregnancy loss: A logistic model | Scientific Reports
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