1. Birth Defects Epidemiology and Surveillance Branch; Texas Department of State Health Services; Austin Texas
2. Stanford University, School of Medicine; Palo Alto California
3. School of Public Health, The University of Texas Health Science Center at Houston; Houston Texas
4. CDC, NCBDDD; Atlanta Georgia
5. Center for Health Statistics; Texas Department of State Health Services
6. Massachusetts State Department of Public Health; Massachusetts Center for Birth Defects Research and Prevention; Boston Massachusetts
7. Tesserae Genetics; Dallas Texas