1. Department of Anthropology, University of California, Davis, CA 95616, USA
2. Department of Biology, University of Utah, Salt Lake City, UT 84112, USA
3. Department of Anthropology, University of Utah
4. Section of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA
5. Department of Biology, Clark University, Worcester, MA 01610, USA
6. Institute of Ecology and Women's Studies, University of Georgia, Athens, GA 30602, USA
7. Department of Organismal and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
8. Department of Psychology, University of California, Berkeley, CA 94720, USA
9. Departments of Anthropology and Psychology, Harvard University
10. Departments of Anthropology and Psychology, University of Michigan, Ann Arbor, MI 48109, USA.