1. Department of Infectious Disease Epidemiology, Imperial College London, London, UK.
2. Clinton Health Access Initiative, Boston, MA 02127, USA.
3. Global Health Group, University of California, San Francisco, CA 94143, USA.
4. National Malaria Control Program, Manzini, Swaziland.
5. Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Paris, France.