1. Department of Anthropology, Yale University, New Haven, CT 06520, USA
2. Department of Anthropology and Archaeology, National University of Mongolia, Ulaanbaatar 14200, Mongolia
3. Department of Archaeology, University of Aberdeen, Aberdeen AB24 3UF, UK
4. Institute for Intercultural and Anthropological Studies, Western Michigan University, Kalamazoo, MI 49008, USA