[1] Brunel Univ London, Div Psychol, London UB8 3PN, England
[2] London Sch Hyg & Trop Med, Dept Populat Hlth, London WC1E 7HT, England
[3] Univ Zurich, CH-8050 Zurich, Switzerland
[4] Univ Zurich, Dept Comparat Language Sci, CH-8050 Zurich, Switzerland
[5] Univ Zurich, Ctr Interdisciplinary Study Language Evolut, CH-8050 Zurich, Switzerland
[6] Max Planck Inst Evolutionary Anthropol, Dept Human Behav Ecol & Culture, D-04103 Leipzig, Germany
[7] Univ Calif Davis, Dept Anthropol, Davis, CA 95616 USA
[8] Univ Utah, Dept Anthropol, Salt Lake City, UT 84112 USA
[9] Penn State Coll Liberal Arts, Dept Anthropol, State Coll, PA 16801 USA
[10] Univ Toulouse 1 Capitole, Inst Adv Study Toulouse, F-31080 Toulouse, France
[11] Univ Illinois, Dept Anthropol, Chicago, IL 60607 USA
[12] Boise State Univ, Dept Anthropol, Boise, ID 83725 USA
[13] Lanzhou Univ, Coll Ecol, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China
[14] Univ New Mexico, Dept Anthropol, Albuquerque, NM 87106 USA
[15] Univ New Mexico, Maxwell Museum Anthropol, Albuquerque, NM 87106 USA
[16] Boston Univ, Anthropol Dept, Boston, MA 02215 USA
[17] Univ Durham, Dept Psychol, Durham DH1 3LE, England
[18] Marien Ngouabi Univ, Fac Lettres Arts & Sci Humaines, Dept anthropol, Brazzaville, DEM REP CONGO
[19] Univ Missouri, Dept Anthropol, Columbia, MO 65201 USA
[20] Oklahoma State Univ, Dept Integrat Biol, Stillwater, OK 74078 USA
[21] Univ Zurich, Dept Psychol, CH-8050 Zurich, Switzerland
[22] Univ Bristol, Bristol Med Sch, Populat Hlth Sci, Bristol BS8 2PS, England
[23] Univ Cambridge, Dept Archaeol, Cambridge CB2 3DZ, England
[24] UCL, Dept Anthropol, London WC1H 0BW, England
[25] Univ Calif Los Angeles, Dept Anthropol, Los Angeles, CA 90095 USA
[26] Univ Calif Santa Barbara, Dept Anthropol, Santa Barbara, CA 93106 USA
[27] Community Agroecol Network, Santa Cruz, CA 95064 USA
[28] Univ Veracruzana, Fac Biol Xalapa, Xalapa 91090, Enriquez, Mexico
[29] East Carolina Univ, Dept Anthropol, Greenville, NC 27858 USA
[30] Univ Washington, Dept Anthropol, Seattle, WA 98105 USA
[31] Univ Liverpool, Dept Archaeol Class & Egyptol, Liverpool L69 7WZ, England
[32] Int Ctr Diarrheal Dis Res, Hlth Syst & Populat Studies Div, Dhaka, Bangladesh