1. Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas
2. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas
3. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Wisconsin-Madison, Madison, Wisconsin
4. Department of Pediatrics, Baylor College of Medicine Children's Clinical Center of Excellence, Kamuzu Central Hospital, Lilongwe, Malawi
5. Department of Immunology, University of Idaho, Moscow, Idaho
6. Department of Obstetrics and Gynecology, Kamuzu Central Hospital, Lilongwe, Malawi