1. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
2. Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
3. Department of Biology, Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA.
4. Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Paris, France.
5. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
6. Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
7. Department of Medicine, School of Public Health, Imperial College London, London, UK.
8. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA.
9. Office of Population Research, Princeton University, Princeton, NJ, USA.