1. Department of EpidemiologyFay W. Boozman College of Public Health, University of Arkansas for Medical Sciences Little Rock Arkansas
2. Fay W. Boozman College of Public HealthUniversity of Arkansas for Medical Sciences, Arkansas Center for Birth Defects Research and Prevention Little Rock Arkansas
3. College of MedicineUniversity of Arkansas for Medical Science Fayetteville Arkansas
4. Department of PediatricsStanford University School of Medicine Palo Alto California
5. Arkansas Children's Research Institute Little Rock Arkansas
6. Division of Maternal‐Fetal Medicine, Department of Obstetrics and GynecologyTripler Army Medical Center Honolulu Hawaii
7. Section of Genetics and Metabolism, Department of PediatricsCollege of Medicine, University of Arkansas for Medical Sciences Little Rock Arkansas
8. Center for Applied Research and Evaluation, Department of PediatricsCollege of Medicine, University of Arkansas for Medical Sciences Little Rock Arkansas