1. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544
2. Division of International Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Bethesda, MD 20892
3. Centre for the Mathematical Modelling of Infectious Diseases, London School of Hygiene & Tropical Medicine, London WC1E 7HT, UK
4. Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London WC1E 7HT, UK
5. Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel
6. School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332
7. School of Physics, Georgia Institute of Technology, Atlanta, GA 30332
8. Institut de Biologie, École Normale Supérieure, Paris 75005, France
9. Princeton School of Public and International Affairs, Princeton University, Princeton, NJ 08542
10. Center for Infectious Disease Control, National Institute for Public Health and the Environment, 3720 Bilthoven, The Netherlands
11. Department of Biomedical Data Sciences, Leiden University Medical Center, 2333 Leiden, The Netherlands
12. Department of Biology, McMaster University, Hamilton, L8S 4L8 ON, Canada
13. Department of Mathematics and Statistics, McMaster University, Hamilton, L8S 4L8 ON, Canada
14. M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, L8S 4L8 ON, Canada