1. NC Department of Health and Human Services, Division of Public HealthWomen's and Children's Health Section Raleigh, North Carolina
2. Center for Health Promotion and Disease PreventionUniversity of North Carolina, Chapel Hill North Carolina
3. Division of Plastic, Maxillofacial, and Oral SurgeryDuke University Durham North Carolina
4. NC Department of Health and Human Services, Division of Public Health, Birth Defects Monitoring ProgramState Center for Health Statistics, Raleigh, North Carolina
5. Department of Maternal and Child HealthUniversity of North Carolina, Chapel Hill North Carolina
6. Departments of Pediatrics and GeneticsUniversity of North Carolina, Chapel Hill North Carolina
7. School of Dentistry and UNC Craniofacial CenterUniversity of North Carolina, Chapel Hill North Carolina