Contrast-Enhanced Ultrasound (CEUS) for the Characterization of Focal Liver Lesions – Prospective Comparison in Clinical Practice: CEUS vs. CT (DEGUM Multicenter Trial) Parts of this Manuscript were presented at the Ultrasound Dreiländertreffen 2008, Davos - Seitz, K.; Strobel, D.; Bernatik, T.; Blank, W.; Friedrich-Rust, M.; Herbay, A. von; Dietrich, C. F.; Strunk, H.; Kratzer, W.; Schuler, A. (Ultraschall in der Medizin - European Journal of Ultrasound, 2009)