1. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia Centre for Disease Control, Vancouver, British Columbia
2. Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba
3. Emeritus, Department of Medicine, University of Alberta, Edmonton, Alberta
4. Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Departments of Internal Medicine and Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada