1. Department of Gastroenterology, Tianjin Medical University General Hospital, Tianjin, 300052, China
2. Department of Gastroenterology, Tianjin Nankai Hospital, Tianjin, 300100, China
3. Central Laboratory, Tianjin Medical University General Hospital, Tianjin, 300052, China
4. Department of Immunology, School of Basic Medical Science, Tianjin Medical University, Tianjin, 300070, China