1. Central Laboratory, The Affiliated Hospital of Nanjing Medical University, Changzhou No. 2 People's Hospital, Changzhou, Jiangsu 213003, P.R. China
2. Department of Gastrointestinal Surgery, The Affiliated Hospital of Nanjing Medical University, Changzhou No. 2 People's Hospital, Changzhou, Jiangsu 213003, P.R. China
3. Department of Pathology, The Affiliated Hospital of Nanjing Medical University, Changzhou No. 2 People's Hospital, Changzhou, Jiangsu 213003, P.R. China