[1] Univ Zurich Hosp, Div Infect Dis, CH-8091 Zurich, Switzerland
[2] Hosp Epidemiol, CH-8091 Zurich, Switzerland
[3] Univ Zurich Hosp, Dept Intens Care Med, CH-8091 Zurich, Switzerland
[4] Univ Zurich Hosp, Dept Clin Pharmacol & Toxicol, CH-8091 Zurich, Switzerland