1. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; Mayo Clinic College of Medicine; Rochester Minnesota USA
2. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; Sainte-Justine University Hospital of Quebec, University of Montreal; Montreal Quebec Canada
3. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine; Allina Health; Minneapolis Minnesota USA