1. Department of Epidemiology and Biostatistics; Texas A&M University; College Station Texas
2. Department of Epidemiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh Pennsylvania
3. University of Texas School of Public Health; Houston Texas
4. Danish Centre for Neonatal Screening; Department of Clinical Biochemistry, Immunology and Genetics; Statens Serum Institut; Copenhagen Denmark
5. Magee-Womens Research Institute; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
6. Department of Obstetrics, Gynecology, and Reproductive Sciences; University of Pittsburgh; Pittsburgh Pennsylvania
7. University of Pittsburgh Clinical and Translational Research; Pittsburgh Pennsylvania
8. Department of Clinical Epidemiology; Aarhus University; Aarhus Denmark