1. Shandong Provincial Key Laboratory of Clinical Research for Pancreatic Diseases, Center for GI Cancer Diagnosis and Treatment, Tumor Immunology and Cytotherapy, Medical Research Center, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
2. Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
3. Department of Endocrinology, The Affiliated Hospital of Qingdao University, Qingdao, 266003, China
4. Phase I Clinical Research Center, The Affiliated Hospital of Qingdao University, Qingdao, 266003, China