1. Department of GastroenterologyRenji HospitalShanghai Jiao Tong University School of Medicine Shanghai China
2. Department of GastroenterologyFirst Affiliated Hospital of Nanchang University Nanchang Jiangxi Province China
3. Department of GastroenterologyPeking University First Hospital Beijing China
4. Division of GastroenterologyFirst Affiliated HospitalSun Yat‐Sen University Guangzhou Guangdong Province China
5. Department of GastroenterologyPeking University Third Hospital Beijing China
6. Department of GastroenterologyNanfang HospitalSouthern Medical University Guangzhou Guangdong Province China
7. Department of GastroenterologyChina‐Japan Friendship HospitalJilin University Changchun Jilin Province China
8. Department of GastroenterologyChanghai HospitalSecond Military Medical University Shanghai China