1. State Key Laboratory of Molecular Oncology, Department of Etiology and Carcinogenesis National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College Beijing PR China
2. Department of Gastroenterology Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College Beijing PR China
3. Department of Oncology The Affiliated Hospital of Yangzhou University, Yangzhou University Yangzhou PR China