1. Department of Gastroenterology, Qingdao Central Hospital, University of Health and Rehabilitation Sciences Qingdao Central Hospital, Qingdao, China
2. Department of Radiotherapy, Qilu Hospital of Shandong University (Qingdao), Qingdao, China
3. Department of Internal Medicine-Oncology, Qingdao Central Hospital, University of Health and Rehabilitation Sciences Qingdao Central Hospital, Qingdao, China
4. Department of Internal Medicine-Oncology, Qingdao Tumor Hospital, Qingdao, China