1. Department of Family and Community Medicine, University of California San Francisco, San Francisco, CA 94110, USA
2. Division of Infectious Diseases, Department of Medicine, Stanford University, Stanford, CA 94305, USA
3. Faculty of Medicine and Health Sciences, University of Zimbabwe, Harare 00263, Zimbabwe
4. Careena Center for Health, Gaborone, Botswana
5. Division of Infectious Diseases, Harvard Medical School, Boston, MA 02115, USA
6. Division of Geographic Medicine and Infectious Diseases, Tufts Medical Center, Boston, MA 02111, USA
7. Collaboratory for Emerging Infectious Diseases and Response (CEIDR), Tufts University, Medford, MA 02155, USA
8. School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA