1. Department of Gastroenterology, The Tenth People’s Hospital of Tongji University, Shanghai 200072, China
2. Department of Gastroenterology, The Tongren Hospital of Shanghai Jiaotong University, Shanghai 200050, China
3. Department of Gastroenterology, Clinical Medical College of the Tenth People’s Hospital of Nangjing Medical University, Shanghai 200072, China
4. Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou 215006, China