1. Division of Cardiology Montreal Heart Institute and Université de Montréal 5000 rue Bélanger Montreal QC H1T 1C8 Canada
2. Cardiovascular Division Brigham and Women's Hospital Boston MA USA
3. Division of Cardiology Medical University of South Carolina Charleston SC USA
4. McGill University Health Centre and McGill University Montreal QC Canada
5. University of Michigan School of Medicine Ann Arbor MI USA