1. Division of Infectious Diseases, Department of Medicine, University of North Carolina, Chapel Hill
2. School of Medicine, University of North Carolina, Chapel Hill
3. Abbott Laboratories, Abbott Park, Illinois
4. University of Sherbrooke, Quebec, Canada
5. Division of Gastroenterology, Department of Medicine, University of North Carolina, Chapel Hill
6. Department of Geography, University of North Carolina, Chapel Hill
7. Gillings School of Global Public Health, Department of Epidemiology, University of North Carolina, Chapel Hill
8. Kinshasa School of Public Health, Kinshasa, Democratic Republic of Congo
9. National AIDS Control Program, Kinshasa, Democratic Republic of Congo