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Body stalk anomaly at 10-14 weeks of gestation.
Daskalakis G, Sebire NJ, Jurkovic D, Snijders RJ, Nicolaides K.
Ultrasound Obstet Gynecol 1997;10:416-8. -
Prevalence of fetal facial cleft at different stages of pregnancy.
Snijders RJ, Sebire NJ, Psara N, Souka A, Nicolaides KH.
Ultrasound Obstet Gynecol 1995;6:327-9.