About the Authors

Mhairi A. Gibson


Affiliation Department of Archaeology and Anthropology, University of Bristol, Bristol, United Kingdom

Eshetu Gurmu

Affiliation Center of Population Studies, College of Development Studies, Addis Ababa University, Addis Ababa, Ethiopia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MAG. Performed the experiments: MAG EG. Analyzed the data: MAG. Wrote the paper: MAG EG.