1. Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, National Key Clinical Specialty, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin, China
2. Department of Immunology, Nankai University School of Medicine, Nankai University, Tianjin, China
3. Department of Gastroenterology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China