1. Air Health Effects Assessment Division, Water and Air Quality Bureau Health Canada Ottawa Ontario Canada
2. Department of Chemistry Carleton University Ottawa Ontario Canada
3. Behaviour, Environment, and Cognition Research Program, Mary MacKillop Institute for Health Research Australian Catholic University Melbourne Victoria Australia
4. Department of Medicine McGill University Montreal Québec Canada
5. Department of Epidemiology, Biostatistics and Occupational Health McGill University Montreal Québec Canada
6. Centre for Outcomes Research and Evaluation Research Institute of the McGill University Hospital Centre Montreal Québec Canada