1. Division of Infectious Diseases, University of Pennsylvania, Philadelphia, Pennsylvania, USA; Botswana–University of Pennsylvania Partnership, Gaborone, Botswana; Department of Medicine, University of Botswana, Gaborone, Botswana
2. Division of Infectious Diseases, University of Pennsylvania, Philadelphia, Pennsylvania, USA; Botswana–University of Pennsylvania Partnership, Gaborone, Botswana
3. Ministry of Health, Government of Botswana, Gaborone, Botswana
4. Division of Infectious Diseases, and Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania, USA
5. Division of Pulmonary and Critical Care Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA