1. Department of Primary Care and Public Health, Imperial College London W6 8RP, UK
2. Institute of Global Health Innovation, Imperial College London SW7 2NA, UK
3. North East North Central London Health Protection Team, Public Health England, London EC4Y 8AE, UK
4. Institute for Global Health, University College London WC1N 1EH, UK
5. Public Health Department, London Borough of Newham, London E16 2QU, UK