Contrast enhanced ultrasound in the detection of liver metastases: a prospective multi-centre dose testing study using a perfluorobutane microbubble contrast agent (NC100100). - Correas JM; Low G; Needleman L; Robbin ML; Cosgrove D; Sidhu PS; Harvey CJ; Albrecht T; Jakobsen JA; Brabrand K; Jenett M; Bates J; et al. (European Radiology, 2011)