About the Authors
- Mhairi A. Gibson
- Department of Archaeology and Anthropology, University of Bristol, Bristol, United Kingdom
- Eshetu Gurmu
- Center of Population Studies, College of Development Studies, Addis Ababa University, Addis Ababa, Ethiopia
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MAG. Performed the experiments: MAG EG. Analyzed the data: MAG. Wrote the paper: MAG EG.