1. Department of Gastroenterology, Digestive Endoscopy Center, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
2. First People’s Hospital of Hangzhou, Hangzhou, Zhejiang, China
3. Department of Gastroenterology, Shihezi People’s Hospital, Shihezi, China
4. The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China