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Good clinical practice advice: Role of ultrasound in the management of twin pregnancy.
FIGO Working Group on Good Clinical Practice in Maternal-Fetal Medicine.
Int J Gynaecol Obstet 2019;144:338-339. pdf -
One-stage screening for pregnancy complications by color doppler assessment of the uterine arteries at 23 weeks' gestation.
Albaiges G, Missfelder-Lobos H, Lees C, Parra M, Nicolaides KH.
Obstet Gynecol 2000;96:559-64.