About the Authors
Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
Department of Statistics, University of Washington, Seattle, Washington, United States of America
The authors have declared that no conflicts of interest exist.
MP conceived and designed the experiments. ADR and YG performed the experiments. SEP, MS, and MP analyzed the data. MS, SP, and MP contributed reagents/materials/analysis tools. All authors contributed to the writing of the paper.