1. Graduate School, Hebei North University, Zhangjiakou 075000, China
2. Department of Ultrasound Medicine, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
3. Department of Anus and Intestine Surgery, Tianjin People's Hospital, Tianjin 300122, China
4. Department of General Surgery, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
5. Institute of Tumor, The First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, China
6. Integrated Chinese and Western Medicine Hospital, Tianjin University, Tianjin 300100, China