[1] Univ Hosp Bern, Dept Infect Dis, CH-3010 Bern, Switzerland
[2] Univ Zurich Hosp, Dept Infect Dis, CH-8091 Zurich, Switzerland
[3] Cantonal Hosp St Gallen, Dept Infect Dis, St Gallen, Switzerland
[4] Univ Basel Hosp, Dept Obstet, CH-4031 Basel, Switzerland
[5] Inst Social & Prevent Med, Data Ctr Swiss HIV Cohort Study, Lausanne, Switzerland
[6] UCL, UCL Inst Child Hlth, MRC, Ctr Epidemiol Child Hlth, London, England
[7] Univ Zurich Hosp, Dept Obstet, CH-8091 Zurich, Switzerland
[8] Cantonal Hosp Lugano, Dept Infect Dis, Lugano, Switzerland
[9] Univ Lausanne Hosp, Dept Infect Dis, Lausanne, Switzerland
[10] Univ Hosp Geneva, Dept Obstet, Geneva, Switzerland
[11] Univ Basel Hosp, Dept Infect Dis, CH-4031 Basel, Switzerland
[12] Univ Hosp Geneva, Dept Infect Dis, Geneva, Switzerland
[13] Univ Childrens Hosp, Dept Nephrol, Basel, Switzerland