1. The First Clinical School of Nanjing Medical University, Nanjing 210029, P.R. China
2. Department of General Surgery, the First Affiliated Hospital with Nanjing Medical University, Nanjing 210029, P.R. China
3. China Center of Clinical Laboratory, Nanjing Medical University Affiliated Cancer Hospital, Cancer Institute of Jiangsu Province, Baiziting 42, Nanjing 210009, P.R. China