1. Department of Medicine,
2. Department of Community Health Sciences, Environmental Health Research Group, Institute of Public Health, and
3. Department of Surgery, University of Calgary, Calgary, Alberta, Canada
4. Air Health Science Division, Health Canada, Ottawa, Ontario, Canada
5. Department of Geography, and
6. Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
7. Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
8. Population Studies Division, Health Canada, Ottawa, Ontario, Canada
9. Institute of Health: Science, Technology and Policy, Carleton University, Ottawa, Ontario, Canada