[1] Univ British Columbia, Dept Psychol, Vancouver, BC V6T 1Z4, Canada
[2] Univ British Columbia, Dept Econ, Vancouver, BC V6T 1Z4, Canada
[3] Univ Calif Los Angeles, Dept Anthropol, Los Angeles, CA 90095 USA
[4] Univ Calif Davis, Ctr Populat Biol, Davis, CA 95616 USA
[5] Univ Calif Davis, Dept Anthropol, Davis, CA 95616 USA
[6] Univ Calif Davis, Dept Environm Sci & Policy, Davis, CA 95616 USA
[7] Univ Calif Santa Barbara, Dept Anthropol, Santa Barbara, CA 93106 USA
[8] CALTECH, Div Humanities & Social Sci, Pasadena, CA 91125 USA
[9] Texas A&M Univ, Dept Anthropol, College Stn, TX 77843 USA
[10] Univ Nottingham, Sch Econ, Nottingham NG7 2DR, England
[11] Coll DuPage, Dept Anthropol, Glen Ellyn, IL 60137 USA
[12] Univ Los Andes, Fac Econ, Bogota 111711, Colombia
[13] Univ Zurich, Dept Econ, CH-8006 Zurich, Switzerland
[14] Santa Fe Inst, Northampton, MA 01060 USA
[15] Cent European Univ, Northampton, MA 01060 USA
[16] Univ Medio Ambiente, Mexico City 51200, DF, Mexico
[17] Inst Tecnol Autonomo Mexico, Mexico City 51200, DF, Mexico
[18] Guilford Coll, Dept Sociol & Anthropol, Greensboro, NC 27410 USA
[19] Providence Hlth Care, Ctr Hlth Evaluat & Outcome Sci, Vancouver, BC, Canada
[20] Arizona State Univ, Sch Human Evolut & Social Change, Tempe, AZ 85287 USA
[21] Washington Univ, George Warren Brown Sch Social Work, St Louis, MO 63130 USA
[22] Calif State Univ Fullerton, Dept Anthropol, Fullerton, CA 92831 USA
[23] Univ Cambridge, Dept Anthropol, Cambridge CB2 3DZ, England
[24] Univ Colorado, Dept Anthropol, Denver, CO 80217 USA
[25] Boise State Univ, Dept Anthropol, Boise, ID 83725 USA