1. Department of Radiology; Medstar Georgetown University Hospital; Washington DC USA
2. Department of Diagnostic Radiology; University of Texas MD Anderson Cancer Center; Houston Texas USA
3. University of California San Diego Health System, Department of Radiology; San Diego California USA
4. Department of Radiology; New York Presbyterian-Columbia University Medical Center; New York New York
5. Department of Radiology; Thomas Jefferson University; Philadelphia Pennsylvania USA
6. Liver Imaging Group; University of California San Diego; San Diego California USA