1 Department of Public Health Sciences, Queen's University, Canada.
2 Department of Health Sciences, Carleton University, Ottawa, Ontario, Canada.
3 Occupational Cancer Research Center, Toronto, Ontario, Canada.
4 College of Public Health and Human Sciences, Oregon State University, Corvallis, Oregon, USA.
5 Department of Cancer Epidemiology and Prevention Research, Cancer Control Alberta, Alberta Health Services, Calgary, Alberta, Canada; Department of Oncology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada; Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
6 Department of Public Health Sciences, Queen's University, Canada. Electronic address: kingw@queensu.ca.