[1] Univ Hosp North Staffordshire, Acad Dept Child Hlth, Stoke On Trent, Staffs, England
[2] Wythenshawe Hosp, Manchester Adult Cyst Fibrosis Ctr, Manchester M23 9LT, Lancs, England
[3] Univ Hosp North Staffordshire, Dept Microbiol, Stoke On Trent, Staffs, England
[4] Keele Univ, Inst Sci & Technol Med, Guy Hilton Res Ctr, Stoke On Trent, Staffs, England
[5] Acad Sci Czech Republic, J Heyrovsky Inst Phys Chem, Prague, Czech Republic