1. Department of GastroenterologyChangzheng Hospital, Second Military Medical University Shanghai China
2. Department of GastroenterologyPeking University People's Hospital Beijing China
3. Division of Gastroenterology, Hepatology and NutritionVirginia Commonwealth University and McGuire VA Medical Center Richmond Virginia USA
4. Medical Department of Established Products DivisionAbbott Laboratories Trading (Shanghai) Co., Ltd. Shanghai China