1. Center for Birth Defects Research and Prevention Massachusetts Department of Public Health Boston Massachusetts
2. Harvard TH Chan School of Public Health Harvard University Boston Massachusetts
3. Harvard Medical School Harvard University Boston Massachusetts
4. Brigham and Women’s Hospital Boston Massachusetts
5. Congenital Malformations Registry New York State Department of Health Albany New York
6. University of North Carolina Gillings School of Global Public Health Chapel Hill North Carolina
7. Stanford University School of Medicine Stanford University Stanford California
8. College of Public Health The University of Iowa Iowa City Iowa
9. Texas Department of State Health Services Austin Texas