1 Department of Radiology, The Second Hospital of Dalian Medical University, 467 Zhong Shan Road, Dalian, 116023, People's Republic of China.
2 Department of Radiology, The Second Hospital of Dalian Medical University, 467 Zhong Shan Road, Dalian, 116023, People's Republic of China. Electronic address: tianjuan1104@126.com.