1. New York State Department of HealthCongenital Malformations Registry Albany New York
2. Department of Epidemiology and Biostatistics, School of Public HealthUniversity at Albany Rensselaer New York
3. Department of EpidemiologySchool of Public Health, Boston University Boston Massachusetts
4. Department of EpidemiologyCollege of Public Health, University of Iowa Iowa City Iowa
5. Department of PediatricsWeill Cornell Medical College New York New York