1 Department of Archaeology and Heritage Studies, Aarhus University, Aarhus, 8270 Højbjerg, Denmark.
2 Palaeogenomics and Bio-Archaeology Research Network, Research Laboratory for Archaeology and the History of Art, University of Oxford, Oxford OX1 3QY, UK.
3 Department of Anthropology, Southern Methodist University, Dallas, TX 75275, USA.
4 Institute of Archaeology, University College London, Gordon Square, London WC1H 0PY, UK. marc.linden@ucl.ac.uk.