Preoperative Prediction of Microvascular Invasion in Patients With Hepatocellular Carcinoma Based on Radiomics Nomogram Using Contrast-Enhanced Ultrasound oleh Di Zhang, Qi Wei, Ge-Ge Wu, Xian-Ya Zhang, Wen-Wu Lu, Wen-Zhi Lv, Jin-Tang Liao, Xin-Wu Cui, Xue-Jun Ni, Christoph F. Dietrich