1. Department of Abdominal Surgical Oncology, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China
2. Academy of Medical Sciences, Peking Union Medical College, Beijing, China
3. Department of Gastroenterology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
4. Department of Internal Medicine, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China
5. State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China
6. Laboratory of Cell and Molecular Biology, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China