1 London Centre for Neglected Tropical Disease Research, Department of Infectious Disease Epidemiology, Faculty of Medicine, St Marys Campus, Imperial College London, London, UK. b.abtew@imperial.ac.uk.
2 Bacterial, Parasitic and Zoonotic Disease Research Directorate, Ethiopian Public Health Institute, Addis Ababa, Ethiopia.
3 London Centre for Neglected Tropical Disease Research, Department of Infectious Disease Epidemiology, Faculty of Medicine, St Marys Campus, Imperial College London, London, UK.
4 Disease Prevention and Health Promotion Core Process, Ministry of Health, Addis Ababa, Ethiopia.
5 Children's Investment Fund Foundation, London, UK.