1. Division of HIV, Infectious Diseases, and Global Medicine, Department of Medicine, Zuckerberg San Francisco General Hospital and Trauma Center, University of California, San Francisco School of Medicine, San Francisco
2. Centre for Infectious Disease Research in Zambia, Lusaka, Zambia
3. Department of Internal Medicine, University Teaching Hospital, Lusaka, Zambia
4. Division of Infectious Diseases, Washington University School of Medicine, St Louis, Missouri