Corresponding Author

Department of gastroenterology, Zhongshan Hospital, Fudan University, Evidence-based Medicine Center, Shanghai, China

Correspondence

Dr Xiaoqing Zeng, Department of gastroenterology, Zhongshan Hospital，Fudan University，Shanghai 200032，China. Email: zeng.xiaoqing@zs-hospital.sh.cn Address:No.180，Fenglin Road, Xuhui District, Shanghai, China

Dr Shi-yao Chen, Department of gastroenterology, Zhongshan Hospital，Fudan University，Evidence-based Medicine Center，Shanghai 200032，China. Email: chen.shiyao@zs-hospital.sh.cn Address:No.180，Fenglin Road, Xuhui District, Shanghai, China