1. Division of HIV/AIDS, Infectious Diseases, and Global Medicine, University of California, San Francisco, San Francisco General Hospital
2. Centre for Infectious Diseases Research in Zambia, Lusaka
3. Johns Hopkins University School of Medicine, Baltimore, Maryland
4. University of Alabama, Birmingham
5. Department of Epidemiology and Biostatistics, University of California, San Francisco
6. Division of Epidemiology, University of California Berkeley