Social Networks and Cooperation in Hunter-Gatherers - SUPPLEMENT

1 Institute for Quantitative Social Science, Harvard University, Cambridge, MA 02138, USA 2 Department of Health Care Policy, Harvard Medical School, Boston, MA 02115, USA 3 Department of Anthropology, Cambridge University, Cambridge, CB2 3DZ, UK 4 Medical Genetics Department, University of California, San Diego, CA 92103, USA 5 Political Science Department, University of California, San Diego, CA 92103, USA 6 Department of Sociology, Harvard University, Cambridge, MA 02138, USA 7 Department of Medicine, Harvard Medical School, Boston, MA 02115, USA