1. Centre Hospitalier Affilié Universitaire de Québec; Québec; Canada
2. Section of Vascular Investigations; Oslo Vascular Centre; Faculty of Medicine; Oslo University Hospital; University of Oslo; Oslo; Norway
3. Department of Clinical Physiology; Karolinska University Hospital; Karolinska Institute; Stockholm; Sweden
4. Department of Cardiology; Karolinska University Hospital; Karolinska Institute; Stockholm; Sweden
5. Division of Cardiology; Faculty of Medicine; Oslo University Hospital; University of Oslo; Oslo; Norway