1. Department of Diagnostic and Interventional Radiology, Division of Experimental and Imaging, University Hospital Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany.
2. Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY.
3. Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.
4. Department of Biomedical Sciences and Morphological and Functional Imaging, University Hospital Messina, Messina, Italy.