1 Foothills Medical Centre, University of Calgary, Calgary, Alberta, Canada; University of Ottawa Heart Institute, Ottawa, Ontario, Canada. Electronic address: juan.russo@albertahealthservices.ca.
2 Memorial University of Newfoundland, St John's, Newfoundland and Labrador, Canada.
3 University of Ottawa Heart Institute, Ottawa, Ontario, Canada.
4 University of Ottawa Heart Institute, Ottawa, Ontario, Canada; Mayo Clinic School of Medicine, Rochester, Minnesota, USA.
5 University of British Columbia, Vancouver, British Columbia, Canada.
6 University of Alberta, Edmonton, Alberta, Canada.
7 Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark.