Contrast-Enhanced Ultrasound (CEUS) for the Characterization of Focal Liver Lesions in Clinical Practice (DEGUM Multicenter Trial): CEUS vs. MRI – a Prospective Comparison in 269 Patients - Seitz, K.; Bernatik, T.; Strobel, D.; Blank, W.; Friedrich-Rust, M.; Strunk, H.; Greis, C.; Kratzer, W.; Schuler, A. (Ultraschall in der Medizin - European Journal of Ultrasound, 2010)