-
Meta-analysis of second-trimester markers for trisomy 21.
Agathokleous M, Chaveeva P, Poon LC, Kosinski P, Nicolaides KH.
Ultrasound Obstet Gynecol 2013;41:247-61. -
A model for a new pyramid of prenatal care based on the 11 to 13 weeks' assessment.
Nicolaides KH.
Prenat Diagn 2011;31:3-6.