1. SafetyNet Centre for Occupational Health and Safety Research, Memorial University St. John's Newfoundland Canada
2. Occupational Cancer Research Centre, Cancer Care Ontario Toronto Ontario Canada
3. Occupational and Environmental Health, School of Population and Public HealthUniversity of British Columbia Vancouver British Columbia Canada
4. Department of Clinical Epidemiology, Faculty of MedicineMemorial University St. John's Newfoundland Canada
5. Occupational Health Clinics for Ontario Workers Ottawa Ontario Canada
6. Department of Medicine and Public Health SciencesSt. Michael's Hospital/University of Toronto, Toronto, Ontario, Canada
7. Division of Biological Risks and Occupational HealthInstitut national de santé publique du Québec (Quebec Institute of Public Health) Montreal Quebec Canada
8. Department of Social and Preventive MedicineSchool of Public Health, Université de Montreal Montreal Quebec Canada