1 Division of Hepatology, Liver Disease Center, the Affiliated Hospital of Qingdao University, Qingdao 266000, China; Department of Organ Transplantation, the Affiliated Hospital of Qingdao University, Qingdao 266000, China.
2 Department of Gastroenterology, the Affiliated Hospital of Qingdao University, Qingdao 266000, China.
3 Department of Gastroenterology, the Affiliated Hospital of Qingdao University, Qingdao 266000, China. Electronic address: xieman1123@126.com.