Affiliation: | University College London Hospitals, National Health Service Foundation Trust, London, UK (E. Gil, N. Sweeney, V. Barrett, S. Morris-Jones, V.J. Johnston, M. Brown);Central and North West London National Health Service Foundation Trust, London (R.F. Miller);University College London, London (R.F. Miller);London School of Hygiene and Tropical Medicine, London (R.F. Miller, V.J. Johnston, M. Brown) |