1. Operative Unit of Clinical Microbiology; Laboratory of Virology; St. Orsola-Malpighi University Hospital; Bologna Italy
2. Pediatric Oncology and Haematology Unit “Lalla Seràgnoli”; Department of Pediatrics; St. Orsola-Malpighi University Hospital; Bologna Italy
3. Department of Biomedical and Neuromotor Sciences; Unit of Hygiene and Biostatistics; University of Bologna; Bologna Italy
4. Department of Specialised, Experimental, and Diagnostic Medicine; Operative Unit of Clinical Microbiology; Laboratory of Virology; St. Orsola-Malpighi University Hospital; University of Bologna; Bologna Italy