1. Department of Ecology and Evolutionary Biology, Princeton, NJ, USA
2. Department of Biology, McMaster University, Hamilton, Ontario, Canada
3. Department of Mathematics and Statistics, McMaster University, Hamilton, Ontario, Canada
4. M. G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
5. Department of Pathology and Laboratory Medicine, University of Western Ontario, London, Ontario, Canada
6. School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
7. School of Physics, Georgia Institute of Technology, Atlanta, GA, USA
8. Princeton School of Public and International Affairs, Princeton, NJ, USA
9. Division of International Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Bethesda, MD, USA