[1] Univ Athens, Dept Propaedeut Med 1, Athens, Greece
[2] Univ Athens, Dept Surg 1, Athens, Greece
[3] Natl Med Inst, Dept Mol Microbiol, Warsaw, Poland
[4] Univ Antwerp, Dept Med Microbiol, Vaccine & Infect Dis Inst, B-2020 Antwerp, Belgium
[5] Univ Hosp Geneva, Infect Control Program, Geneva, Switzerland
[6] Univ Geneva, Sch Med, CH-1211 Geneva, Switzerland