1. Department of Evolutionary Anthropology Duke University Durham North Carolina USA
2. Institute of Psychology Leiden University Leiden The Netherlands
3. Department of Statistics Brigham Young University Provo Utah USA
4. Dian Fossey Gorilla Fund Atlanta Georgia USA
5. School of Psychological and Cognitive Sciences and Beijing Key Laboratory of Behavior and Mental Health Peking University Beijing China
6. Center for Cognitive Neuroscience Duke University Durham North Carolina USA