1. Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast, Northern Ireland, UK
2. Department of Gastroenterology, Belfast City Hospital, Belfast, Northern Ireland, UK
3. School of Dentistry, Queen’s University, The Royal Group of Hospitals, Belfast City Hospital,Belfast, Northern Ireland, UK
4. Northern Ireland Regional Adult Cystic Fibrosis Centre, Belfast City Hospital,Belfast, Northern Ireland, UK
5. Department of Respiratory Medicine, Queen’s University, Belfast City Hospital,Belfast, Northern Ireland, UK