[1] Queens Univ Belfast, Wellcome Wolfson Inst Expt Med, Belfast, North Ireland
[2] Royal Brompton Hosp, part Guys & St Thomas? NHS Fdn Trust, Adult Cyst Fibrosis Ctr, London, England
[3] Imperial Coll London, Natl Heart & Lung Inst, London, England
[4] Univ Childrens Hosp Cologne, Fac Med, CF Ctr Pediat Pulmonol & Allergol, D-50937 Cologne, Germany
[5] Univ Cologne, Univ Hosp Cologne, D-50937 Cologne, Germany
[6] Univ Cologne, Fac Med, Ctr Rare Dis Cologne, D-50937 Cologne, Germany
[7] Mukoviszidose e V & Mukoviszidose Inst gGmbH Dauen, D-53117 Bonn, Germany
[8] European Cyst Fibrosis Soc Clin Trials Network, Karup, Denmark
[9] Queens Univ Belfast, Wellcome Wolfson Inst Expt Med, Northern Ireland Clin Res Facil, Belfast, North Ireland
[10] Univ Hosp Gasthuisberg, Herestr 49, B-3000 Leuven, Belgium