1. Brighton and Sussex Centre for Global Health Research, Brighton and Sussex Medical School, University of Sussex, Brighton, UK
2. Center for Innovative Drug Development and Therapeutic Trials for Africa (CDT-Africa), Addis Ababa University, Addis Ababa, Ethiopia
3. School of Public Health, Addis Ababa University, Addis Ababa, Ethiopia
4. Department of Primary Care and Public Health, Brighton and Sussex Medical School, University of Sussex, Brighton, UK