1. Departments of Cardiology and Medicine, Karolinska University Hospital, and Karolinska Institute, Eugeniavägen 3, Solna , 17176 Stockholm , Sweden
2. Department of Clinical Sciences, Lund University , Malmö , Sweden
3. Libin Cardiovascular Institute, University of Calgary , Calgary, Alberta , Canada
4. Department of Cardiology, National Heart & Lung Institute, Hammersmith Hospital Campus , London , UK