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Single umbilical artery at 11-14 weeks' gestation: relation to chromosomal defects.
Rembouskos G, Cicero S, Longo D, Sacchini C, Nicolaides KH.
Ultrasound Obstet Gynecol 2003;22:567-70. -
Umbilical cord hematoma associated with an umbilical cord cyst and fetal death at 28 weeks of gestation.
Brown R, Nicolaides K.
J Ultrasound Med 2000;19:223-225.