1. Division of Gastroenterology and Hepatology Key Laboratory of Gastroenterology & Hepatology, Ministry of Health, Shanghai Institute of Digestive Disease, Renji Hospital, School of Medicine, Shanghai Jiao Tong University Shanghai China
2. Department of Medicine Michael E DeBakey Veterans Affairs Medical Center and Baylor College of Medicine Houston Texas
3. Clinical Research Center Shanghai Jiao Tong University School of Medicine Shanghai China