Affiliation: | 1. Department of Anthropology, University of Minnesota, Minneapolis, U.S.A.;2. Department of Ecology, Evolution and Behavior, University of Minnesota, St Paul, U.S.A.;3. Department of Anthropology, Bates College, Lewiston, U.S.A.;4. Department of Biology, Bates College, Lewiston, U.S.A.;5. Department of Human Evolutionary Biology, Harvard University, Cambridge, U.S.A. |