1. Women and Infants Hospital, Providence, Rhode Island
2. National Institute of Child Health and Human Development, Bethesda, Maryland
3. Indiana University, Indianapolis, Indiana
4. Research Triangle Institute, Research Triangle Park, North Carolina
5. University of Texas Southwestern Medical Center at Dallas, Dallas, Texas
6. University of Cincinnati, Cincinnati, Ohio
7. University of Miami, Miami, Florida
8. Yale University, New Haven, Connecticut