1. Department of Radiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Shandong province, Jinan, China
2. Department of Radiology, Yantai Yuhuangding Hospital, Shandong province, Yantai, China
3. Department of Radiology, Lanshan Branch of Yantai Yuhuangding Hospital, Shandong province, Yantai, China
4. Department of Radiology, Yaitai Shan Hospital, Shandong province, Yantai, China