1. Firestone Institute for Respiratory Health; Asthma Research Group; St Joseph's Hospital Healthcare 50 Charlton Avenue East Hamilton Ontario Canada L8N 4A6
2. St George's, University of London; Population Health Sciences and Education; London UK
3. University of Alberta; Department of Emergency Medicine; Room 1G1.43 Walter C. Mackenzie Health Sciences Centre 8440 112th Street Edmonton Alberta Canada T6G 2B7
4. University of Alberta; School of Public Heath; Edmonton Canada