| Affiliation: | 1. Texas A&M Health Science Center, School of Rural Public Health, , College Station, Texas;2. Slone Epidemiology Center at Boston University, , Boston, Massachusetts;3. Texas Department of State Health Services, Environmental Epidemiology and Disease Registries, , Austin, Texas;4. Texas Department of State Health Services, Birth Defects Epidemiology and Surveillance Branch, , Austin, Texas;5. Department of Epidemiology, College of Public Health, University of Iowa, , Iowa City, Iowa;6. Department of Pediatrics, College of Medicine, University of Arkansas for Medical Sciences, , Little Rock, Arkansas |
