1. Department of General Surgery, Shandong, Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong Province, China
2. Department of General Surgery, The First Affiliated Hospital of Shandong First Medical University, Jinan, Shandong Province, China
3. Department of Vascular Surgery, Shandong Provincial Third Hospital, Shandong University, Jinan, Shandong Province, China