1. Department of Gastroenterological Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
2. Department of Gastroenterological Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
3. Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong, China
4. Department of Clinical Medicine, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
5. Department of Gastroenterology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China