[1] G Gaslini Inst Children, Dept Hematol & Oncol, Infect Dis Unit, I-16147 Genoa, Italy
[2] G Gaslini Inst Children, Bone Marrow Transplant Unit, I-16147 Genoa, Italy
[3] G Gaslini Inst Children, Microbiol Lab, I-16147 Genoa, Italy
[4] G Gaslini Inst Children, Serv Radiol, I-16147 Genoa, Italy
[5] G Gaslini Inst Children, Epidemiol & Biostat Sect, Sci Directorate, I-16147 Genoa, Italy
[6] Univ Genoa, San Martino Univ Hosp, Dept Hematol & Oncol, Div Infect Dis, Genoa, Italy