1. Fetal nuchal translucency: ultrasound screening for chromosomal defects in first trimester of pregnancy;Nicolaides, K.H.; Azar, G.; Byrne, D.; Mansur, C.; Marks, K.;BMJ,1992
2. High frequency of cytogenetic abnormalities in fetuses with cystic hygroma diagnosed in the first trimester;Shulman, L.P.; Emerson, D.S.; Felker, R.; Phillips, O.P.; Simpson, J.L.; Elias, S.;Obstet Gynecol,1992
3. Non-echogenic oedema as a marker in trisomy 21 screening;Schulte-Vallentin, M.; Schindler, H.;Lancet,1992
4. First-trimester simple hygroma: cause and outcome;Johnson, M.P.; Johnson, A.; Holzgreve, W.;Am J Obstet Gynecol,1993
5. Nonechogenic nuchal oedema as a marker in trisomy 21 screening;van Zalen-Sprock RM; van Vugt JMG; van Geijn HP;Lancet,1992