Clinical characteristics of patients and newborns.

Data are presented as mean ± SD (range). All pregnancies were singleton and pregnant women were normotensive, nonsmoking, non-alcohol or drug consuming, and without intrauterine infection or any other medical or obstetrical complications. In Pulsatility index left and right uterine artery, *P<0.05 versus values in second and third trimester; †P<0.05 versus values in third trimester.