-
Cervical assessment at the routine 23-weeks' scan: problems with transabdominal sonography.
To MS, Skentou C, Cicero S, Nicolaides KH.
Ultrasound Obstet Gynecol 2000;15:292-6. -
Cervicovaginal fibronectin and cervical length at 23 weeks of gestation: relative risk of early preterm delivery.
Heath VC, Daskalakis G, Zagaliki A, Carvalho M, Nicolaides KH.
BJOG 2000;107:1276-81.