[1] Univ Bern, Inst Infect Dis, Bern, Switzerland
[2] Univ Bern, Grad Sch Cellular & Biomed Sci, Bern, Switzerland
[3] Univ Basel, Kantonsspital Baselland, Univ Clin Internal Med, Bruderholz, Switzerland
[4] Cantonal Hosp St Gallen, Dept Infect Dis, St Gallen, Switzerland
[5] Kantonsspital Lucerne, Dept Infect Dis & Hosp Epidemiol, Luzern, Switzerland
[6] Univ Bern, Dept Infect Dis, Bern Univ Hosp, Bern, Switzerland