1 Department of Obstetrics & Gynecology, Northwestern University Feinberg School of Medicine, 250 E. Superior St., Room 05-2175, Chicago, IL 60611. Electronic address: Allison.Sakowicz@northwestern.edu.
2 Department of Obstetrics & Gynecology, Northwestern University Feinberg School of Medicine, 250 E. Superior St., Room 05-2175, Chicago, IL 60611.
3 Division of Neonatology, Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL.
4 Division of Infectious Diseases, Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL.
5 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, IL.