1. University of Illinois at Chicago, Chicago, Illinois
2. Northwestern University/Children's Memorial Hospital, Chicago, Illinois
3. Clinical Trials Surveys Corp, Baltimore, Maryland
4. Baylor College of Medicine, Houston, Texas
5. Columbia College of Physicians and Surgeons, New York, New York
6. State University of New York Health Science Center at Brooklyn, Brooklyn, New York
7. Boston Medical Center, Boston, Massachusetts
8. University of Puerto Rico, San Juan, Puerto Rico