1 Department of Obstetrics and Gynecology, Thomas Jefferson University Hospital, Philadelphia, PA.
2 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, The University of North Carolina at Chapel Hill, 3009 Old Clinic Bldg. Campus Box 7570, Chapel Hill, NC 27599. Electronic address: johanna_quist-nelson@med.unc.edu.
3 Sidney Kimmel Medical College at Thomas Jefferson University Hospital, Philadelphia, PA.
4 Faculty of Medicine and Health, Sydney Institute for Women Children and their Families/Sydney Local Health District, School of Public Health, The University of Sydney, New South Wales, Australia.
5 Faculty of Health, Sydney Institute for Women Children and their Families/Sydney Local Health District, School of Nursing and Midwifery, University of Technology, New South Wales, Australia.
6 Department of Obstetrics and Gynecology, Angers University Hospital, Angers Cedex, France.
7 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Thomas Jefferson University Hospital, Philadelphia, PA.