[1] Univ Udine, Dept Med, Infect Dis Clin, Piazzale Misericodia 15-33100, Udine, Italy
[2] Presidio Osped Univ Santa Maria Misericordia, Azienda Sanit Univ Integrata, Piazzale Misericodia 15, I-33100 Udine, Italy
[3] Univ Genoa DISSAL, IRCCS Oncol, Osped Policlin San Martino, Infect Dis Unit, Genoa, Italy
[4] Hygeia Gen Hosp, Dept Internal Med 6, 4 Erythrou Stavrou Str & Kifis, Athens, Greece
[5] Natl & Kapodistrian Univ Athens, Med Sch, Laikon Hosp, Dept Propaedeut Med 1, Athens, Greece
[6] Univ Athens, Univ Hosp Attikon, Med Sch, Dept Crit Care, Athens, Greece
[7] Natl & Kapodistrian Univ Athens, Med Sch, Dept Internal Med 4, Athens, Greece
[8] Univ Turin, Infect Dis Amedeo Savoia Hosp, Dept Med Sci, Turin, Italy
[9] Univ Florence, Dept Expt & Clin Med, Florence, Italy
[10] Florence Careggi Univ Hosp, Clin Microbiol & Virol Unit, Florence, Italy
[11] Univ Cattolica Sacro Cuore, Fdn Policlin Univ Agostino Gemelli, Inst Infect Dis, Rome, Italy
[12] Ctr Antiinfect Res & Dev, Hartford, CT USA
[13] Hartford Hosp, Div Infect Dis, Hartford, CT USA
[14] Univ Bologna, S Orsola Malpighi Hosp, Dept Internal Med Geriatr & Nephrol Dis, Clin Infect Dis, Bologna, Italy