1. Department of Pathology, Shandong University Qilu Hospital, Jinan, P. R. China
2. Department of General Surgery, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Jinan, P. R. China
3. Key Laboratory of Metabolism and Gastrointestinal Tumor, The First Affiliated Hospital of Shandong First Medical University, Jinan, P. R. China
4. Key Laboratory of Laparoscopic Technology, The First Affiliated Hospital of Shandong First Medical University, Jinan, P. R. China
5. Shandong Medicine and Health Key Laboratory of General Surgery, Jinan, P. R. China