Acknowledgements
We would like to acknowledge the support provided by Peter Smith from the London School of Hygiene and Tropical Medicine, Nicholas Grassly from the Imperial College London, Jason Andrews from Stanford University, Andrew Pollard and Xinxue Liu from the University of Oxford, Supriya Kumar and Thea Norman from the Bill and Melinda Gates Foundation, and Jayaprakash Muliyil from the Christian Medical College Vellore, with the design of this project.