1. Department of Cardiology, Angiology and Pulmology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120 Heidelberg, Germany
2. Department of Medicine, Innlandet Hospital Trust Division Lillehammer, Lillehammer, Norway
3. Hull York Medical School, Castle Hill Hospital, Hull, UK
4. Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
5. Medical Clinic, Helse Møre and Romsdal HF, Ålesund, Norway
6. Department of Cardiology, Oslo University Hospital, Ulleval and Institute of Clinical Sciences, University of Oslo, Oslo, Norway
7. National Heart and Lung Institute, Royal Brompton and Harefield Hospitals, Imperial College, London, UK
8. Robertson Centre for Biostatistics and Clinical Trials, Glasgow, UK