1. Department of Health Sciences, University of Firenze, Florence, Italy;
2. Nephrology Unit, University Hospital, Parma, Italy;
3. Department of Pathology and
4. Department of Radiology, Albert Schweitzer Hospital, Dutch National Center of expertise for retroperitoneal fibrosis, Dordrecht, The Netherlands;
5. Nephrology and Dialysis Unit, Meyer Children’s Hospital, Florence, Italy;
6. Department of Radiology, University Hospital, Parma, Italy;
7. Department of Pediatric Hematology and Oncology, Meyer Children’s Hospital, Florence, Italy;
8. Department of Biomedical, Experimental and Clinical Sciences “Mario Serio," University of Firenze, Florence, Italy; and
9. Department of Nephrology, Albert Schweitzer Hospital, Dutch National Center of Expertise for Retroperitoneal Fibrosis, Dordrecht, The Netherlands