[1] Univ Zurich, Univ Hosp Zurich, Div Infect Dis, Raemistr 100, CH-8091 Zurich, Switzerland
[2] Univ Zurich, Hosp Epidemiol, Univ Hosp Zurich, Raemistr 100, CH-8091 Zurich, Switzerland
[3] Univ Zurich, Inst Med Virol, Zurich, Switzerland
[4] Univ Basel, Inst Nursing Sci, Basel, Switzerland
[5] Univ Bern, Bern Univ Hosp, Dept Infect Dis, Bern, Switzerland
[6] Cantonal Hosp Aarau, Dept Infect Dis & Hosp Hyg, Aarau, Switzerland
[7] Ctr Infect Dis Zurich, Zurich, Switzerland
[8] Univ Basel, Univ Hosp Basel, Div Infect Dis & Hosp Epidemiol, Basel, Switzerland
[9] Cantonal Hosp St Gallen, Div Infect Dis, St Gallen, Switzerland
[10] Univ Hosp Geneva, Primary Care Med Div, Geneva, Switzerland
[11] Univ Lausanne, Dept Intens Care Med, Intens Care Unit, Lausanne, Switzerland
[12] Univ Hosp Ctr Lausanne, Lausanne, Switzerland
[13] Reg Hosp Lugano, Div Infect Dis, Lugano, Switzerland
[14] Univ Zurich, Epidemiol Biostat & Prevent Inst, Dept Publ & Global Hlth, Zurich, Switzerland