Genomic comparison of esophageal squamous cell carcinoma and its precursor lesions by multi-region whole-exome sequencing Tekijä Xi-Xi Chen, Qian Zhong, Yang Liu, Shu-Mei Yan, Zhang-Hua Chen, Shan-Zhao Jin, Tian-Liang Xia, Ruo-Yan Li, Ai-Jun Zhou, Zhe Su, Yu-Hua Huang, Qi-Tao Huang, Li-Yun Huang, Xing Zhang, Yan-Na Zhao, Jin-Ping Yun, Qiu-Liang Wu, Dong-Xin Lin, Fan Bai, Mu-Sheng Zeng