1. 1Pediatric Oncology and Hematology “Lalla Seràgnoli”, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
2. 2Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
3. 3Department of Medical and Surgical Sciences, Microbiomics Unit, University of Bologna, Bologna, Italy
4. 4Department of Pharmacy and Biotechnology, Unit of Microbiome Science and Biotechnology, University of Bologna, Bologna, Italy
5. 5Pediatric Emergency Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
6. 6Department and Clinic of Pediatric Oncology, Hematology and Bone Marrow Transplantation, Wrocław Medical University, Wrocław, Poland
7. 7Department of Mother and Child, Pediatric Hematology Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
8. 8Pediatric Hematology/Oncology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
9. 9Department of Pediatric Hematology and Oncology, Bambino Gesù Children’s Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Rome, Italy
10. 10Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
11. 11Catholic University of the Sacred Heart, Rome, Italy