Is Contrast-Enhanced US Alternative to Spiral CT in the Assessment of Treatment Outcome of Radiofrequency Ablation in Hepatocellular Carcinoma? - Ricci, P.; Cantisani, V.; Drudi, F.; Pagliara, E.; Bezzi, M.; Meloni, F.; Calliada, F.; Erturk, S. M.; D’Andrea, V.; D’Ambrosio, U.; Passariello, R. (Ultraschall in der Medizin - European Journal of Ultrasound, 2009)