1. Center for the Advanced Study of Human Paleobiology, Department of Anthropology, The George Washington University, 800 22nd Street, NW, Washington, DC 20052, USA
2. Department of Anthropology, University of Illinois at Urbana-Champaign, 109 Davenport Hall, 607 S. Mathews Avenue, Urbana, IL 61801, USA
3. Department of Biology, Chatham University, Woodland Road, Pittsburgh, PA 15232, USA
4. Psychology, University of Stirling, Stirling, Scotland FK9 4LA, UK
5. Center for Research on Genomics and Global Health, National Human Genome Research Institute, National Institute of Health, 12 South Drive, MSC 5635, Bethesda, MD 20892, USA