1. Department of Gastroenterology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, China
2. Department of Gastroenterology, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai 200233, China
3. Medical College, Soochow University, Suzhou Jiangsu, 215213, China
4. Cyclization College, Nanchang Aeronautical University, Jiangxi, Nanchang 330063, China