1. Departments of Medicine, Microbiology and Infectious Diseases, University of Calgary, Calgary, AB, Canada
2. Departments of Medicine University of Calgary, Calgary, AB, Canada
3. Northern Ireland Regional Adult Cystic Fibrosis Centre, Belfast City Hospital, Belfast, UK
4. Northern Ireland Regional Adult Cystic Fibrosis Centre, Belfast City Hospital, Belfast, and Centre for Infection and Immunity, Queen’s University of Belfast, Belfast, UK