1 Department of Gastroenterology, Center of Tumor Immunology and Cytotherapy, Medical Research Center of The Affiliated Hospital of Qingdao University, Qingdao 266003, China.
2 Department of Human Resources, The Affiliated Hospital of Qingdao University, Qingdao 266003, China.
3 Department of Oncology, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou 450008, China.
4 Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China.