1. The Johns Hopkins University, Baltimore, Maryland
2. Center for Biostatistics in AIDS Research, Harvard School of Public Health, Boston, Massachusetts
3. University of Pittsburg Medical Center, Pennsylvania
4. Los Angeles Biomedical Research Institute at Harbor UCLA, Torrance, California
5. Drexel University College of Medicine, Philadelphia, Pennsylvania
6. Case Western Reserve University, Cleveland, Ohio
7. University of Alabama at Birmingham
8. University of Colorado Hospital, Aurora, Colorado
9. University of Cincinnati Medical Center, Ohio
10. Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts