1. Department of General Surgery, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
2. Institute of Oncology, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
3. Central Laboratory, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
4. Clinical Laboratory, Hebei General Hospital, Shijiazhuang, Shijiazhuang 05000, China