1. New York State Department of HealthCongenital Malformations Registry Albany New York
2. Department of Epidemiology and BiostatisticsSchool of Public Health, University at Albany Rensselaer New York
3. Division of Medical Genetics, Department of PediatricsNew York‐Presbyterian Hospital/Weill Cornell Medicine New York New York
4. Department of EpidemiologyCollege of Public Health, University of Iowa Iowa City Iowa