1. Department of Archaeology, University of York, York, UK
2. Department of Mathematics, University of York, York, UK
3. Independent researcher
4. Department of Archaeology, Anthropology and Forensic Science, Bournemouth University, Poole, UK
5. Bird Group, Department of Life Sciences, Natural History Museum, Hertfordshire, UK
6. Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, UK
7. Department of Life Sciences and Systems Biology, University of Turin, Turin, Italy
8. Natural History Museum, University of Copenhagen, Copenhagen, Denmark