1 Department of Infectious Disease Epidemiology London School of Hygiene & Tropical Medicine London, UK.
2 Department of Public Health Sciences Karolinska Institutet Stockholm, Sweden, Research School of Population Health Australian National University Canberra, ACT, Australia <email></email>, Email: debora.pedrazzoli@lshtm.ac.uk.
3 Department of Public Health Sciences Karolinska Institutet Stockholm, Sweden.