1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, MedStar Washington Hospital Center, Washington, District of Columbia, USA.
2. National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA.
3. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, Pennsylvania, USA.
4. MedStar Health Research Institute, Washington, District of Columbia, USA.
5. MedStar Washington Hospital Center, Washington, District of Columbia, USA.
6. Department of Obstetrics and Gynecology, Maimonides Medical Center, Brooklyn, New York, USA.
7. Division of Genetics & Metabolism, Children's National Hospital, Washington, District of Columbia, USA.
8. Department of Emergency Medicine, University of Michigan, Ann Arbor, Michigan, USA.
9. Metabolon, Inc., Raleigh, North Carolina, USA.
10. Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Mississippi Medical Center, Jackson, Mississippi, USA.
11. Division of Infectious Diseases, Children's National Hospital, Washington, District of Columbia, USA.
12. Elizabeth Glaser Pediatric AIDS Foundation, Washington, District of Columbia, USA.
13. Division of Medical Genetics, Department of Pediatrics, University of Mississippi Medical Center, Jackson, Mississippi, USA.