1. Department of General Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215000, P.R. China
2. Department of Infectious Diseases, The Second Affiliated Hospital and Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China
3. Department of Pathology, Wenzhou People's Hospital, Wenzhou, Zhejiang 325027, P.R. China
4. Department of General Surgery, The Second Affiliated Hospital and Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China