1. Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
2. Clinatec/LETI/CEA, 38054 Grenoble, France
3. Department of Radiology, University Hospitals of Geneva, 1211 Geneva, Switzerland
4. Radiology Department, Lyon-Sud Hospital, University Hospitals of Lyon, 69495 Pierre Bénite, France
5. CREATIS, CNRS UMR5220, INSERM U1044, University of Lyon, INSA Lyon, 69621 Villeurbanne, France