[1] Département de Radiologie, Division de Radiodiagnostic et Radiologie Interventionnelle, Hôpital Cantonal Universitaire de Genève, Rue Micheli-du-Crest 24, CH-1211 Geneva 14, Switzerland
[2] Istituto di Radiologia, Università di Genova, Genoa, Italy
[3] Department of Radiology, Ciutat Sanitaria i Universitaria Vall d'Hebron, Autonomous University of Barcelona, Barcelona, Spain
[4] Department of Diagnostic Imaging, Ospedale Vittorio Emanuele III, Gorizia, Italy