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1 Centre for Human Evolution Research (CHER), Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK. j.galway-witham@nhm.ac.uk c.stringer@nhm.ac.uk.
1 Centre for Human Evolution Research (CHER), Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK. j.galway-witham@nhm.ac.uk c.stringer@nhm.ac.uk.