1. School of Human Kinetics, Laurentian University, Sudbury, ON, Canada
2. Centre for Research in Occupational Safety and Health, Laurentian University, Sudbury, ON, Canada
3. Department of Medicine, Division of Occupational Medicine, University of Toronto, Toronto, ON, Canada
4. Department of Occupational and Environmental Health, St. Michael's Hospital, Toronto, ON, Canada
5. Engineering and Controls Technology Branch, National Institute for Occupational Safety and Health, Morgantown, WV, USA