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