About the Authors

Jordi van Gestel

jordivangestel@gmail.com

Affiliations Program for Evolutionary Dynamics, Departments of Organismic and Evolutionary Biology and Mathematics, Harvard University, Boston, Massachusetts, United States of America, Theoretical Research in Evolutionary Life Sciences, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, the Netherlands

Martin A. Nowak

Affiliation Program for Evolutionary Dynamics, Departments of Organismic and Evolutionary Biology and Mathematics, Harvard University, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JvG MAN. Performed the experiments: JvG. Analyzed the data: JvG MAN. Contributed reagents/materials/analysis tools: JvG. Wrote the paper: JvG MAN.