1. Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, USA;
2. Department of Anthropology, University of Oregon, Eugene, OR, USA;
3. Department of Anthropology, University of California, Santa Barbara, CA, USA;
4. Broom Center for Demography, University of California, Santa Barbara, CA, USA;
5. Center for Evolutionary Psychology, University of California, Santa Barbara, CA, USA;
6. Department of Anthropology, University of Colorado, Colorado Springs, CO, USA;
7. Department of Anthropology, Queens College, Flushing, NY, USA;
8. Department of Anthropology, Yale University, New Haven, CT, USA;
9. Institute of Cognitive and Decision Sciences, University of Oregon, Eugene, OR, USA