1. Columbia College of Physicians and Surgeons, New York, New York
2. University of Illinois at Chicago, Chicago, Illinois
3. Institute of Human Virology, Baltimore, Maryland
4. Baylor College of Medicine, Houston, Texas
5. Boston Medical Center, Boston, Massachusetts
6. University of Puerto Rico, San Juan, Puerto Rico
7. State University of New York Health Science Center at Brooklyn, Brooklyn, New York
8. National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland