1. 1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology; and Division of Hematology, Department of Medicine, Duke University Medical Center, Durham, NC
2. 2 Divisions of Maternal Fetal Medicine and Surgical Critical Care, Departments of Obstetrics, Gynecology, and Anesthesiology, University of Texas Medical Branch, Galveston, TX
3. 3 Washington Center for Bleeding Disorders, Division of Hematology, Department of Medicine, University of Washington, Seattle, WA