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Prediction of preterm delivery in twins by cervical assessment at 23 weeks.
Skentou C, Souka AP, To MS, Liao AW, Nicolaides KH.
Ultrasound Obstet Gynecol 2001;17:7-10. -
Assessment of endothelial function in normal twin pregnancy.
Savvidou MD, Donald AE, Nicolaides KH.
Ultrasound Obstet Gynecol 2001;17:220-3.