1. Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
2. Division of Infectious Diseases and HIV Medicine, Department of Medicine, University of Cape Town, Cape Town, South Africa
3. Faculty of Life Sciences, University College London, London, UK
4. The Francis Crick Institute, London, UK
5. Department of Medicine, Imperial College London, London, UK