1. Division of Perinatal Pathology, Women and Infants Hospital, Brown University, Alpert School of Medicine, Providence, Rhode Island
2. Department of Statistics and Epidemiology, RTI International Research Triangle Park, Research Triangle Park, North Carolina
3. Department of Pediatric Pathology, UTMB at Galveston, Galveston, Texas
4. Josefine Heim-Hall, UTHSC at San Antonio School of Medicine, San Antonio, Texas
5. Pathology Laboratory, Egleston Hospital, Atlanta, Georgia
6. Department of Statistics and Data Analysis, RTI International, Kansas City, Missouri
7. Department of Maternal and Fetal Medicine, Tufts University School of Medicine, Boston, Massachusetts
8. Department of Pediatric Pathology, Primary Children's Medical Center, Salt Lake City, Utah
9. Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland