About the Authors
- Kimmo Eriksson
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* E-mail: kimmoe@gmail.com
Affiliations School of Education, Culture and Communication, Mälardalen University, Västerås, Sweden, Centre for the Study of Cultural Evolution, Stockholm University, Stockholm, Sweden
- Olle Häggström
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Affiliation Mathematical Statistics, Chalmers University of Technology, Göteborg, Sweden
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Analyzed the data: KE. Wrote the paper: KE OH.