About the Authors
- Matthew W. Campbell
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* E-mail: matthew.campbell@emory.edu
Affiliation Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
- Frans B. M. de Waal
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Affiliation Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: MWC FBMW. Performed the experiments: MWC. Analyzed the data: MWC. Wrote the paper: MWC FBMW.