1 Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu, China.
2 State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center of Biotherapy, Chengdu, China.
3 Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu, China. wangziqiang@scu.edu.cn.