Dan Fei1, Li-Ping Ma2, Hong-Ping Yuan3, Dong-Xu Zhao4. 1. Department of Ultrasonographic, China-Japan Union Hospital of Jilin University, Changchun 130033, Jilin, PR China. 2. China-Japan Union Hospital of Jilin University, Changchun, 130033, PR China. 3. Department of Nephrology, The Fourth Hospital of Jilin University, Changchun 130000, Jilin, PR China. 4. Department of Orthopaedic Surgery, China-Japan Union Hospital of Jilin University, Changchun 130033, Jilin, PR China. Electronic address: 1732084133@qq.com.