1 Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China.
2 Department of Radiology, Tianjin Medical University General Hospital, Tianjin, PR China.
3 Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin, PR China. Electronic address: mwang02@tmu.edu.cn.