1. Massachusetts Department of Public Health Center for Birth Defects Research and Prevention Boston Massachusetts USA
2. Boston University School of Public Health Boston Massachusetts USA
3. New York State Department of Health Birth Defects Registry Albany New York USA
4. Arkansas Center for Birth Defects Research and Prevention University of Arkansas for Medical Sciences Little Rock Arkansas USA
5. Arizona Department of Health Services Arizona Birth Defects Monitoring Program Phoenix Arizona USA
6. Texas Department of State Health Services Birth Defects Epidemiology and Surveillance Branch Austin Texas USA
7. Louisiana Department of Health Office of Public Health New Orleans Louisiana USA
8. College of Public Health University of South Florida Tampa Florida USA
9. Perelman School of Medicine at the University of Pennsylvania and the Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
10. Utah Department of Health Bureau of Children with Special Health Care Needs, Utah Birth Defect Network Salt Lake City Utah USA