1. Department of Medicine, Division of Occupational Medicine, University of Toronto, Toronto, ON, Canada
2. Division of Occupational Medicine, St. Michael’s Hospital, Toronto, ON, Canada
3. Division of Preventive Medicine, Department of Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
4. Occupational and Environmental Medicine, Centre hospitalier de l’université de Montréal, Montréal, QC, Canada