Absence of nasal bone in fetuses with trisomy 21 at 11–14 weeks of gestation: an observational study

Fetal nuchal translucency: ultrasound screening for chromosomal defects in first trimester of pregnancy.

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A screening program for trisomy 21 at 10–14 weeks using fetal nuchal translucency, maternal serum free β‐human chorionic gonadotropin and pregnancy‐associated plasma protein‐A

Kevin Spencer, Vivienne Souter, Natasha Tul et al. · Ultrasound in Obstetrics and Gynecology · 1999 · 571 citations

Medicine, Maternal Health, Obstetrics +17

Antenatal maternal serum screening for Down's syndrome: results of a demonstration project.

N J Wald, Anne Kennard, J. W. Densem et al. · BMJ · 1992 · 294 citations · Full text

Medicine, Maternal Health, Obstetrics +17

The functional matrix

Melvin L. Moss · Medical Entomology and Zoology · 1962 · 200 citations

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George A. Coleman · Oral Surgery Oral Medicine Oral Pathology · 1962 · 198 citations