1. Department of Epidemiology, Human Genetics and Environmental Sciences, University of Texas School of Public Health; Southwest Center for Occupational and Environmental Health; Houston Texas
2. Department of Pediatrics, Section of Hematology-Oncology; Baylor College of Medicine; Houston Texas
3. National Center on Birth Defects and Developmental Disabilities; Centers for Disease Control and Prevention; Atlanta Georgia
4. Birth Defects Epidemiology and Surveillance Branch; Texas Department of State Health Services; Austin Texas
5. Department of Biostatistics; University of Texas School of Public Health; Houston Texas