1. Leeds Institute of Health Sciences, University of Leeds, Charles Thackrah Building, 101 Clarendon Road, Leeds, West Yorkshire LS2 9LJ, UK
2. Regional Adult CF Unit, Leeds Teaching Hospitals NHS Trust, St James’ University Hospital, Beckett Street, Leeds LS9 7TF, UK
3. Regional Paediatric CF Unit, Leeds General Infirmary, Great George Street, Leeds LS1 3EX, UK