1. Max Planck Institute for the Science of Human History; Kahlaische Str. 10 D-07745 Jena Germany
2. McDonald Institute for Archaeological Research; Downing St Cambridge CB2 3ER UK
3. Archaeology; University of York; York YO10 5DD UK
4. Leibniz-Laboratory for Isotope Research; Christian-Albrechts-Universität; D-24118 Kiel Germany