1 Dental Anthropology Group, National Research Center on Human Evolution, 09002 Burgos, Spain maria.martinon@cenieh.es yanjun_cai@xjtu.edu.cn.
2 Anthropology Department, University College London, London WC1H 0BW, United Kingdom.
3 Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China maria.martinon@cenieh.es yanjun_cai@xjtu.edu.cn.
4 Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China.
5 Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing, 100044, China.
6 Dental Anthropology Group, National Research Center on Human Evolution, 09002 Burgos, Spain.