1. Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China
2. Medical Research Center, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China
3. Department of Pediatric Surgery, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China
4. Department of Pathology, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China
5. Department of Medical Equipment, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China
6. Department of Surgery, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China