1. Johns Hopkins University; Evidence-based Practice Center; Hampton House, 6th Floor 624 North Broadway Baltimore MD USA 21205-1901
2. Queen Elizabeth University Hospital (The Southern General Hospital); West of Scotland Adult CF Unit; 1345 Govan Road Glasgow UK G51 4TF
3. Johns Hopkins University; Department of Medicine; 1830 E. Monument St., Suite 8068 Baltimore MD USA 21287