1. Department of Medical Imaging, The First Affiliated Hospital of Hebei North University, Zhangjiakou, Hebei 075000, P.R. China
2. Graduate School, Hebei North University, Zhangjiakou, Hebei 075000, P.R. China
3. Department of Medical Imaging, Beijing Huairou Hospital, Beijing 101400, P.R. China
4. Department of Cardiothoracic Surgery, The First Affiliated Hospital of Hebei North University, Zhangjiakou, Hebei 075000, P.R. China