1. Vaccines for Africa Initiative, School of Public Health, University of Cape Town, Cape Town 7925, South Africa
2. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town 7925, South Africa
3. School of Public Health, University of Cape Town, Cape Town 7925, South Africa
4. Modelling and Simulation Hub, Africa (MASHA), Department of Statistical Sciences, University of Cape Town, Cape Town 7700, South Africa
5. Department of Paediatrics and Child Health, Red Cross War Memorial Children’s Hospital, University of Cape Town, Cape Town 7700, South Africa
6. Centre for Global Health, Nuffield Department of Medicine, Oxford University, Oxford OX3 7LG, UK