1. Department of Medicine, University Health Network, University of Toronto, Toronto, Ontario, Canada
2. Department of Medicine, University of Calgary, Calgary, Alberta, Canada
3. Department of Medicine, McGill University, Montreal, Québec, Canada
4. Department of Medicine, Université de Montréal, Montreal, Québec, Canada
5. Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
6. Department of Medicine, University of British Columbia and Centre for Heart Lung Innovation, St Paul's Hospital, Vancouver, British Columbia, Canada
7. Department of Medicine, McMaster University, Hamilton, Ontario, Canada