1. Department of Internal Medicine, No. 4 West China Teaching Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chengdu Medical College, Chengdu Medical College, Chengdu, Sichuan 610041, P.R. China
3. Department of Hematology and Research Laboratory of Hematology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
4. State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan 610041, P.R. China