1 Department of Pediatric Surgery, Regina Margherita Children's Hospital, University Hospital of health and Science, Turin, Italy. Electronic address: riccardoguan@gmail.com.
2 Department of Pediatric Surgery, Regina Margherita Children's Hospital, University Hospital of health and Science, Turin, Italy.
3 Pediatric Radiology Unit, Regina Margherita Children's Hospital, University Hospital of health and Science, Turin, Italy.