International gestational age-specific centiles for umbilical artery Doppler indices: a longitudinal prospective cohort study of the INTERGROWTH-21st Project
1 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Università di Roma Tor Vergata, Ospedale Cristo Re, 00167, Rome, Italy. Electronic address: giuseppe.rizzo@uniroma2.it.
2 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Università di Roma Tor Vergata, Ospedale Cristo Re, 00167, Rome, Italy.
3 Department of Obstetrics and Gynecology, I.M. Sechenov First Moscow State Medical University, Moscow, Russia.
4 Department of Obstetrics and Gynecology, University of Chieti, Chieti, Italy.