1. Wolfson Diabetes and Endocrine Clinic, Addenbrooke’s Hospital, Cambridge, U.K.
2. Adult Cystic Fibrosis Centre, Papworth Hospital, Cambridge, U.K.
3. Department of Clinical Biochemistry, John Radcliffe Hospital, Oxford, U.K.
4. Adult Cystic Fibrosis Clinic, Royal Brompton Hospital, London, U.K.