1. Department of Gastrointestinal Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
2. Department of Medical Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
3. Department of Pathology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China