1. Princeton Environmental Institute, Princeton University, Princeton, NJ, USA.
2. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA.
3. Department of Geosciences, Princeton University, Princeton, NJ, USA.
4. Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, NJ, USA.
5. Division of International Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Bethesda, MD, USA.