[1] Univ Nottingham Hosp, Queens Med Ctr, Dept Microbiol, Nottingham NG7 2UH, England
[2] Univ Nottingham Hosp, Queens Med Ctr, Dept Paediat Neurosurg, Nottingham NG7 2UH, England
[3] Univ Nottingham Hosp, Queens Med Ctr, Publ Hlth Lab, Nottingham NG7 2UH, England
[4] City Hosp, Paediat Renal Unit, Nottingham NG5 1PB, England