1. Division of Preventive Medicine, University of Alberta, 5-22 University Terrace, Edmonton, AB T6G 2T4 Canada
2. Division of Occupational Medicine, Department of Medicine, University of Toronto, C. David Naylor Building, 6 Queen’s Park Crescent West, Toronto, ON, M5S 3H2 Canada
3. Department of Environmental and Occupational Health, Drexel University, Philadelphia, PA 19104, USA
4. Faculty of Kinesiology, University of Calgary, Calgary AB T2N 4N1, Canada
5. Research Department, Institut de recherche Robert-Sauvé en santé et en sécurité du travail, 505 de Maisonneuve Blvd West Montreal, QC H3A 3C2, Canada
6. Department of Medicine, Cumming School of Medicine, University of Calgary; 3330 Hospital Dr NW Calgary, AB T2N 4N1, Canada