1 Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK. Electronic address: Rebecca.Glover@lshtm.ac.uk.
2 UK Centre for Ecology & Hydrology, Wallingford, UK.
3 Department of Tropical Disease Biology, Liverpool School of Tropical Medicine, Liverpool, UK.
4 Department of History, University College Dublin, Dublin, Ireland.