1. a Air Health Science Division, Health Canada , Ottawa , Ontario , Canada
2. b Department of Civil and Environmental Engineering , University of Windsor , Windsor , Ontario , Canada
3. c Consultant , Reston , VA
4. d Exposure and Biomonitoring Division, Health Canada , Ottawa , Ontario , Canada
5. e Analysis and Air Quality Division, Environment Canada , Ottawa , Ontario , Canada
6. f Hazard Identification Division, Health Canada , Ottawa , Ontario , Canada
7. g Exposure Measurements and Analysis Branch, U.S. Environmental Protection Agency , Research Triangle Park , NC
8. h Department of Civil and Environmental Engineering , Carleton University , Ottawa , Ontario , Canada
9. i Department of Chemistry , Carleton University , Ottawa , Ontario , Canada
10. j Populations Studies Division, Health Canada , Ottawa , Ontario , Canada
11. k Air Quality Research Division, Environment Canada , Toronto , Ontario , Canada