[1] Kenya Govt Med Res Ctr, Dept Publ Hlth Res, Wellcome Trust Res Programme, Nairobi, Kenya
[2] Univ Oxford, Nuffield Dept Med, Oxford, England
[3] Univ Oxford, Dept Paediat, Oxford, England
[4] Nairobi City Cty, Dept Curat & Preventat Serv, Nairobi, Kenya
[5] Kenya Med Training Coll, Dept Nursing, Nairobi, Kenya
[6] Nursing Council Kenya, Dept Registrat & Licensing, Nairobi, Kenya