1. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
2. Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
3. Department of Medicine, University of Calgary, Calgary, Alberta, Canada
4. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
5. Department of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
6. Department of Medicine, McGill University, Montreal, Quebec, Canada