1. Congenital Malformations RegistryNYS Department of Health Albany New York
2. Medical Genomic & Metabolic Genetics Branch, National Human Genome Research InstituteNational Institutes of Health Bethesda Maryland
3. Department of PediatricsWeill Cornell Medical College New York New York
4. Department of Epidemiology and Biostatistics, School of Public HealthUniversity at Albany Rensselaer New York