1. Department of Paediatrics, University of Oxford , Oxford , UK
2. HIV Pathogenesis Programme, The Doris Duke Medical Research Institute, University of KwaZulu Natal , Durban , South Africa
3. Department of Paediatrics and Child Health, University of KwaZulu Natal , Durban , South Africa
4. Department of Paediatrics, Queen Nandi Regional Hospital , Empangeni , South Africa
5. Africa Health Research Institute , Durban , South Africa
6. Division of Infection and Immunity, University College London , London , UK
7. The Francis Crick Institute , London , UK
8. Department of Infectious Diseases, University College London Hospital , London , UK
9. Nuffield Department of Medicine, University of Oxford , Oxford , UK