[1] Luigi Sacco Hosp, Dept Infect Dis, Milan, Italy
[2] Busto Arsizio Hosp, Dept Infect Dis, Busto Arsizio, BM, Italy
[3] Univ Perugia, Dept Internal Med, I-06100 Perugia, Italy
[4] Hosp Santa Maria della Misericordia, Dept Infect Dis, Perugia, Italy