1 Health in Humanitarian Crises Centre, London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK; Médecins Sans Frontières, Amsterdam, Netherlands. Electronic address: james.smith@amsterdam.msf.org.
2 Médecins Sans Frontières, Brussels, Belgium.
3 Centre for Education and Research in Humanitarian Action, University of Geneva, The Graduate Institute, Geneva, Switzerland.