1 Department of Global Health and Development, London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK. Electronic address: melissa.parker@lshtm.ac.uk.
2 Department of Sociology and Social Work, Njala University, Bo, Sierra Leone.
3 Department of Community Health and Clinical Studies, Njala University, Bo, Sierra Leone.
4 Department of Nursing, Njala University, Bo, Sierra Leone.
5 Centre for Public Authority and International Development, London School of Economics and Political Science, London, UK.