[1] Childrens Hosp Los Angeles, Dept Paediat, Div Hosp Med, Los Angeles, CA 90027 USA
[2] Univ N Carolina, Dept Paediat, Div Neonatol, Chapel Hill, NC 27515 USA
[3] Kamuzu Cent Hosp, Dept Paediat, Lilongwe, Malawi
[4] Malawi Epidemiol & Intervent Res Unit, Lilongwe, Malawi
[5] Cincinnati Childrens Hosp Med Ctr, Dept Paediat, Div Emergency Med, Cincinnati, OH 45229 USA
[6] Univ Cincinnati, Coll Med, Dept Paediat, Cincinnati, OH USA
[7] Univ Illinois, Dept Emergency Med, Chicago, IL USA
[8] Univ Malawi, Coll Med, Blantyre, Malawi