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Twin Pregnancy Complications
Fetal presentation: how twins' positioning affects delivery | BabyCenter
Cord Blood & Tissue Banking for Twins | Cryo-Cell
How many umbilical cords do twins have? - Quora
Two-Vessel Cord: Its Causes, Risk Factors And Effects On Baby
OB Images
Umbilical Cord Stricture is Not a Genetic Anomaly: A Study in Twins - José I. Rodríguez, Adrián Mariño-Enríquez, Judith Suárez-Aguado, Pablo Lapunzina, 2008