1. Medical Research Council Centre for Outbreak Analysis and Modelling, Department of Infectious Disease Epidemiology, School of Public Health, Imperial College London, London SW7 2AZ, UK.
2. Institute for Integrative Biology, Eidgenössische Technische Hochschule Zurich, Zurich 8092, Switzerland.
3. Mathematics Institute, University of Warwick, Coventry, CV4 7AL, UK.
4. School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK.
5. Department of Clinical Sciences, Liverpool School of Tropical Medicine (LSTM), Pembroke Place, Liverpool, L3 5QA, UK.
6. Laboratoire Maladies Infectieuses et Vecteurs Écologie, Génétique, Évolution et Contrôle, UMR CNRS 5290, Institut pour la Recherche et le Développement (IRD), UM1, UM2, Montpellier 34394, France.