1. Department of Pediatrics, Baylor College of Medicine, Houston, Texas
2. Department of Epidemiology, Human Genetics, and Environmental Sciences, The University of Texas Health Science Center at Houston School of Public Health, Dallas
3. Department of Epidemiology, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock
4. Department of Epidemiology, Human Genetics, and Environmental Sciences, The University of Texas Health Science Center at Houston School of Public Health, Houston
5. Arkansas Children’s Hospital, Little Rock
6. Department of Urology, University of Arkansas for Medical Sciences, Little Rock
7. Birth Defects Epidemiology and Surveillance Branch, Texas Department of State Health Services, Austin
8. Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock