[1] Papworth Hosp, Adult Cyst Fibrosis Ctr, Cambridge CB23 3RE, England
[2] Inst Publ Hlth, MRC Biostat Unit, Cambridge CB2 OSR, England
[3] Univ London Imperial Coll Sci Technol & Med, Royal Brompton Hosp, NHLI, London SW3 6LY, England
[4] St Marys Hosp, Dept Resp Med, London W2 1NY, England
[5] St James Univ Hosp, Adult Cyst Fibrosis Ctr, Leeds LS9 7TF, W Yorkshire, England
[6] Belfast City Hosp, Adult Cyst Fibrosis Ctr, Belfast BT9 7AB, Antrim, North Ireland
[7] Papworth Hosp, Dept Pharm, Cambridge CB23 3RE, England
[8] Addenbrookes Hosp, Dept Radiol, Cambridge CB2 OQQ, England
[9] Addenbrookes Hosp, Dept Biochem, Cambridge CB2 OQQ, England
[10] Univ Cambridge, Dept Med, Cambridge CB2 OQQ, England