1. Medway Maritime Hospital; Ear, Nose and Throat Department; Windmill Road Gillingham Kent UK ME7 5NY
2. St George's, University of London; Community Health Sciences; Cranmer Terrace Tooting London UK SW17 ORE
3. Vancouver Coastal Health; Respiratory Divisions; Main Floor 2775 Heather Street Vancouver British Columbia Canada V5Z 3J5
4. Bradford Royal Infirmary; Bradford Institute for Health Research; Duckworth Lane Bradford W. Yorkshire UK BD9 6RJ