Comparison of B-Mode and conventional Colour/Power Doppler ultrasound, contrast-enhanced Doppler ultrasound and spiral-CT in the diagnosis of focal lesions of the liver: results of a multicenter study. - Beissert,M.; Delorme,S.; Mutze,S.; Lees,W.R.; Bahner,M.L.; Filimonow,S.; Gillams,AR.; Zuna,I.; Bauer,A.; Jenett,M. (Ultraschall in Med, 2002)