1. Paul Elliott, Matthew Whitaker, David Tang, Oliver Eales, Barbara Bodinier, Haowei Wang, Christina Atchison, Deborah Ashby, Helen Ward, and Marc Chadeu-Hyam are with the School of Public Health, Imperial College London, UK. Nicholas Steyn and Christl A. Donnelly are with the Department of Statistics, University of Oxford, Oxford, UK. Joshua Elliott is with the Imperial College Healthcare NHS Trust, London. Ara Darzi is with the Institute of Global Health Innovation, Imperial College London. Wendy Barclay...