1. Department of Oncology, SSCVD Trapianto di Cellule Staminali, A.O.U. Città della Salute e della Scienza di Torino, Torino, Italy
2. Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
3. SC Microbiology and Virology, A.O.U. Città della Salute e della Scienza di Torino, Torino, Italy
4. Department of Public Health and Pediatrics, University of Torino, Torino, Italy