1. Department of Gastrointestinal Medical Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
2. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
3. Department of Medical Oncology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
4. Department of Medical Oncology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou, Fujian, China
5. Department of Digestive, Shanxi Province Cancer Hospital, Taiyuan, Shanxi, China
6. Department of Gastrointestinal Medical Oncology, Fudan University Shanghai Cancer Center, No. 270, Dongan Road, Shanghai 200032, China
7. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China