1. From the Departments of Ultrasound (J.H., M.L., Q.L., R.G., Y.L., Z.G., L.L., J.Z.) and Urology (Z.W., Y.Y., K.Y.), Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, No. 651 Dongfeng Rd East, Guangzhou 510060, People’s Republic of China.