1. Hematology/Oncology Division; Woman's and Child's Health Department; Padova University Hospital; Padova Italy
2. Department of Pediatrics; Pediatric Oncology; University “Sapienza”; Rome Italy
3. Radiotherapy Division; Istituto Oncologico Veneto; Padova Italy
4. Pediatric Oncology Unit; Istituto Nazionale Tumori; Milano Italy
5. Woman's and Child's Health Department; Pediatric Surgery; Padova University Hospital; Padova Italy
6. Pathology Department; Padova University Hospital; Padova Italy