1. Department of Surgery, Hospital Clinic i Provincial School of Medicine, University of Barcelona, Villarroel 170, 08 036 Barcelona, Spain
2. Department of Radiology, Hospital Clinic i Provincial School of Medicine, University of Barcelona, Villarroel 170, 08 036 Barcelona, Spain
3. Unit of Renal Transplantation, Hospital Clinic i Provincial School of Medicine, University of Barcelona, Villarroel 170, 08 036 Barcelona, Spain