1 Division of Infectious Diseases and Global Health, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA. Electronic address: [email protected].
2 Fielding School of Public Health, University of California, Los Angeles, CA, USA.
3 Botswana-University of Pennsylvania Partnership, Gaborone, Botswana; Liverpool School of Tropical Medicine, University of Liverpool, Liverpool, UK.
4 Department of Medicine, University of Botswana, Gaborone, Botswana.
5 Luskin School of Public Policy, University of California, Los Angeles, CA, USA.