1. Department of Imaging and Nuclear Medicine, Shandong Medical Imaging Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China;
2. Department of Radiology, School of Medicine, Medical Imaging Research Institute, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong, China;
3. Department of Radiology, School of Medicine, The Affiliated Hospital of Binzhou Medical University, Binzhou Medical University, Binzhou, Shandong, China;
4. Department of Radiology, Yantai Yu Huang Ding Hospital, Yantai, Shandong, China