[1] Univ Bern, Bern Univ Hosp, Dept Infect Dis, Bern, Switzerland
[2] Geneva Univ Hosp, Div Infect Dis, Geneva, Switzerland
[3] Univ Hosp Zurich, Div Infect Dis & Hosp Epidemiol, Zurich, Switzerland
[4] Univ Basel, Kantonsspital Baselland, Dept Med & Infect Dis Serv, Bruderholz, Switzerland
[5] Univ Hosp Zurich, Zurich, Switzerland
[6] Univ Zurich, Div Infect Dis & Hosp Epidemiol, Zurich, Switzerland
[7] Lausanne Univ Hosp, Lausanne, Switzerland
[8] Univ Lausanne, Serv Infect Dis, Lausanne, Switzerland
[9] Univ Hosp Basel, Basel, Switzerland
[10] Univ Basel, Dept Med, Div Infect Dis & Hosp Epidemiol, Basel, Switzerland
[11] Univ Basel, Dept Clin Res, Div Infect Dis & Hosp Epidemiol, Basel, Switzerland
[12] Cantonal Hosp St Gallen, Div Infect Dis & Hosp Epidemiol, St Gallen, Switzerland
[13] Reg Hosp Lugano, Div Infect Dis, Lugano, Switzerland