1. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
2. These authors contributed equally to this work.
3. Department of Biology, The Pennsylvania State University, University Park, PA, USA.
4. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA.
5. Fogarty International Center, National Institutes of Health, Bethesda, MD, USA.