1 Departments of Gastroenterology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.
2 Departments of Gastroenterology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China. lily_cao2000@hotmail.com.
3 Departments of Geriatrics, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China. dancingtx@126.com.
4 Departments of Gastroenterology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China. xiangjunmeng@tom.com.