1. Peter Munk Cardiac Centre and Heart and Stroke Richard Lewar Centre, University of Toronto, Toronto, Ontario, Canada
2. Instituto do Coracao (InCor), Faculdade de Medicina da Universidade de São Paulo, Sao Paulo, Brazil
3. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
4. Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
5. Centre for Headache, Women’s College Hospital, University of Toronto, Toronto, Ontario, Canada
6. Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada