WorldPop Project, Geography and Environment, University of Southampton, Southampton, United Kingdom.|Department of Mathematics, Oregon State University, Corvallis, Oregon, United States of America.|WorldPop Project, Geography and Environment, University of Southampton, Southampton, United Kingdom.|WorldPop Project, Geography and Environment, University of Southampton, Southampton, United Kingdom.|School of Forest Resources and Conservation, Gainesville, Florida, United States of America.|WorldPop Project, Geography and Environment, University of Southampton, Southampton, United Kingdom.|WorldPop Project, Geography and Environment, University of Southampton, Southampton, United Kingdom.|WorldPop Project, Geography and Environment, University of Southampton, Southampton, United Kingdom.|Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States of America.