1 Department of Radiology, Shandong Medical Imaging Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.
2 Department of Radiology, Jinan Shizhong District Hospital, Jinan, Shandong 250002, China.
3 Department of Radiology, Liaocheng Third People's Hospital, Liaocheng, Shandong 252002, China.
4 Department of Radiology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.