1. Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, China
2. Tianjin Institute of Digestive Disease, Tianjin Medical University General Hospital, Tianjin, China
3. Department of Internal Medicine, Tianjin Hexi Hospital, Tianjin, China
4. Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Anshan Road 154, Heping District, Tianjin 300052, China
5. Department of Gastroenterology, Tianjin Medical University General Hospital Airport Hospital, Tianjin, China