[1] Cantonal Hosp St Gallen, Dept Neurol & Stroke Ctr, St Gallen, Switzerland
[2] Cantonal Hosp St Gallen, Div Infect Dis & Hosp Epidemiol, Rorschacherstr 95, CH-9001 St Gallen, Switzerland
[3] Hemostasis Ctr, Ctr Lab Med & Hemophilia, St Gallen, Switzerland
[4] Univ Childrens Hosp Zurich, Div Infect Dis & Hosp Epidemiol, Zurich, Switzerland