Guidelines and good clinical practice recommendations for contrast enhanced ultrasound (CEUS) in the liver--update 2012: a WFUMB-EFSUMB initiative in cooperation with representatives of AFSUMB, AIUM, ASUM, FLAUS and ICUS - Claudon, M; Dietrich, CF; Choi, BI (Ultraschall in der Medizin (Stuttgart, Germany : 1980), 2013)
et al.