-
Clinical significance of first-trimester chorionic bumps: a matched case-control study.
Sana Y, Appiah A, Davison A, Nicolaides KH, Johns J, Ross JA.
Ultrasound Obstet Gynecol 2013;42:585-9. -
Placental volume in twin and triplet pregnancies measured by three-dimensional ultrasound at 11 + 0 to 13 + 6 weeks of gestation.
Wegrzyn P, Fabio C, Peralta A, Faro C, Borenstein M, Nicolaides KH.
Ultrasound Obstet Gynecol 2006;27:647-51.