1. Department of Medical Imaging, The First Hospital Affiliated of Hebei North University, Zhangjiakou 075000, Hebei, China
2. Department of Ultrasound, Zhangjiakou Infectious Diseases Hospital, Zhangjiakou 075000, Hebei, China
3. Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Mudanjiang Medical University, Mudanjiang 157000, Heilongjiang, China