1 Department of Global Health and Development, London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK. Electronic address: clare.chandler@lshtm.ac.uk.
2 Department of Anthropology, University of Sussex, Falmer, Brighton, UK.
3 Department of Sociology, Philosophy and Anthropology, University of Exeter, Exeter, UK.
4 Institute of Development Studies, Brighton, UK.
5 Department of Global Health and Development, London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK.
6 School of Environmental Sciences, Njala University, Sierra Leone.