1. University Health Network/Mount Sinai Hospital, Toronto, Ontario, Canada
2. Centre for Sleep Medicine and Circadian Biology of the University of Toronto, Toronto, Ontario, Canada
3. Universitätsklinikum Regensburg, Regensburg, Germany
4. Hospital Universitario Txagorritxu, Vitoria, Spain
5. Queen's University, Kingston, Ontario, Canada
6. Vancouver General Hospital, University of British Columbia, Vancouver, British Columbia, Canada
7. Juntendo University Hospital, Tokyo, Japan
8. McGill University Health Centre, Montreal, Quebec, Canada
9. St Michael's Hospital, Toronto, Ontario, Canada
10. Instituto do Coração do Hospital das Clínicas da FMUSP, Sao Paulo, Brazil
11. Hôpital Hôtel-Dieu du CHUM, Université de Montréal, Montreal, Quebec, Canada
12. University of Ottawa Heart Institute, Ottawa, Ontario, Canada
13. Capital District Health Authority, Halifax, Nova Scotia, Canada
14. Ospedale San Luca, Milan, Italy
15. University of Arizona College of Medicine, Tucson, Arizona
16. Groupe Hospitalier Pitie-Salpetriere Charles Fox, Paris, France
17. Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec City, Quebec, Canada