[1] Fdn IRCCS Policlin S Matteo, Pavia, Italy
[2] Univ Basel Hosp, Div Infect Dis, CH-4031 Basel, Switzerland
[3] Univ Florence, Dept Publ Hlth, Florence, Italy
[4] San Martino Hosp, Dept Transplant Surg, Genoa, Italy
[5] Ist Giannina Gaslini, I-16148 Genoa, Italy