[1] Univ Lausanne, Univ Lausanne Hosp, Serv Neonatol, Lausanne, Switzerland
[2] Univ Lausanne, Univ Lausanne Hosp, Infect Dis Serv, Lausanne, Switzerland
[3] Univ Childrens Hosp Zurich, Childrens Res Ctr, Div Infect Dis, Zurich, Switzerland
[4] Childrens Hosp Lucerne, Dept Pediat, Luzern, Switzerland
[5] Univ Bern, Inselspital, Dept Pediat, CH-3010 Bern, Switzerland
[6] Univ Hosp Geneva, Childrens Hosp Geneva, Pediat Infect Dis Unit, Geneva, Switzerland
[7] Univ Childrens Hosp Basel, Infect Dis & Vaccinol, Basel, Switzerland
[8] Childrens Hosp Aarau, Dept Pediat, Aarau, Switzerland
[9] Childrens Hosp Eastern Switzerland St Gallen, Dept Infect Dis, St Gallen, Switzerland
[10] Univ Zurich Hosp, Dept Neonatol, CH-8091 Zurich, Switzerland
[11] Childrens Hosp Chur, Dept Pediat, Chur, Switzerland
[12] Univ Queensland, Paediat Crit Care Res Grp, Mater Res Inst, Brisbane, Qld, Australia