1. Department of Cardiology, Copenhagen University Hospital Herlev and Gentofte, Post 635, Gentofte Hospitalsvej 1, 2900 Hellerup, Denmark
2. Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool, UK
3. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
4. The Danish Heart Foundation, 1127 Copenhagen K, Denmark