1 Linda-Gail Bekker is deputy director at The Desmond Tutu HIV Centre, University of Cape Town, Cape Town, South Africa. linda-gail.bekker@hiv-research.org.za.
2 Valerie Mizrahi is director at the Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa. valerie.mizrahi@uct.ac.za.