1. Department of Obstetrics and Gynecology; Eastern Virginia Medical School; Norfolk Virginia
2. Department of Clinical Genetics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
3. Department of Pediatrics; Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania
4. Division of Medical Genetics and Metabolism; Children's Hospital of The King's Daughters; Norfolk Virginia
5. Department of Pediatrics; Eastern Virginia Medical School; Norfolk Virginia