1. Botswana Harvard AIDS Institute Partnership, Princess Marina Hospital, Plot No. 1836, Northring Road, Gaborone, Botswana.
2. Keck School of Medicine, University of Southern California, 1845 N. Soto Street, Los Angeles, California, 90032, USA.
3. University of California, San Diego, Division of Infectious Diseases and Global Public Health, 9500 Gilman Drive, La Jolla, CA 92093 USA.