A second group of women with no history of chronic hypertension will be identified as potential subjects for the control cohort. Each potential subject will have a detailed review of her complete medical, surgical, gynecologic, and obstetrical history will be obtained as dictated by standard care. Appropriate management for each potential subject's medical and obstetrical condition will be provided according to accepted practice. Potential subjects for this cohort will be obstetrical patients cared for at the Regional Perinatal Center, Division of Maternal Fetal Medicine, Department of Obstetrics & Gynecology, SUNY Upstate Medical University.