1. Department of Gastrointestinal Surgery, Qilu Hospital, Cheeloo College of Medicine, Shandong University 1 , Shandong 250012, People’s Republic of China
2. Gastrointestinal Surgery, The Third Affiliated Hospital of Shandong First Medical University 2 , Shandong 250031, People’s Republic of China
3. Centre Lab, The Third Affiliated Hospital of Shandong First Medical University 3 , Shandong 250031, People’s Republic of China