About the Authors
- Alan Cross, Mark Collard
- Laboratory of Human Evolutionary Studies, Department of Archaeology, Simon Fraser University, Burnaby, British Columbia, Canada
- Mark Collard
- Department of Anthropology, University of Missouri, Columbia, Missouri, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AC. Performed the experiments: AC. Analyzed the data: AC MC. Contributed reagents/materials/analysis tools: AC. Wrote the paper: AC MC.