1. Division of International Medicine and Infectious Diseases, Department of Medicine, Weill Medical College of Cornell University, New York, New York 10021.
2. Department of Statistics, Rutgers University, Piscataway, New Jersey 08854.
3. Montefiore Medical Center, Bronx, New York 10467.
4. Data Solutions, Bronx, New York 10463.
5. School of Public Health, New York Medical College, Valhalla, New York 10595.
6. Center for Infectious Diseases and Virology, University of Southern California Keck School of Medicine, Los Angeles, California 90033.
7. CORE Center/Cook County Hospital, Rush Medical College, Chicago, Illinois 80612.
8. State University of New York Health Science Center at Brooklyn, Brooklyn, New York 11203.