1 Department of Human Behavior, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Leipzig 04103, Germany; anne_kandler@eva.mpg.de.
2 Institute of Archaeology, University College London, London WC1H 0PY, United Kingdom.
3 Department of Archaeology, School of Geography, Archaeology and Environmental Sciences, University of the Witwatersrand, WITS 2050, South Africa.