1 Pediatric Oncology Department, Regina Margherita Children's Hospital, AOU Città della Salute e della Scienza di Torino, Turin 10126, Italy; Department of Public Health and Paediatric Sciences, University of Torino, Turin, Italy. Electronic address: franca.fagioli@unito.it.
2 Pediatric Oncology Department, Regina Margherita Children's Hospital, AOU Città della Salute e della Scienza di Torino, Turin 10126, Italy; Department of Public Health and Paediatric Sciences, University of Torino, Turin, Italy.