Herce, Michael E; Hoffmann, Christopher J; Fielding, Katherine; Topp, Stephanie M; Hausler, Harry; Chimoyi, Lucy; Smith, Helene J; Chetty-Makkan, Candice M; Mukora, Rachel; Tlali, Mpho; Olivier, Abraham J; Muyoyeta, Monde; Reid, Stewart E; Charalambous, Salome