 - Control group: Women will be matched to women with preeclampsia according to gestational age at diagnosis of pre-eclampsia, maternal age in stratum of 5 years, gender, ethnicity 4 categories: Caucasian, black, Asian and other and body mass index 5 classes: 20, 20-25, 26-30, 31-35 and 35. Patients of this group should be at low risk of obstetric complications at recruitment and planning to deliver at the CHUS. 