1. Department of Clinical Sciences, Lund University, Lund, Sweden
2. Department of Cardiology, Skåne University Hospital, Inga Marie Nilssons gata 46, Malmö 20502, Sweden
3. Department of Medicine, University of Oklahoma Health Sciences Center and VA Medical Center, Oklahoma City, OK, USA
4. Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
5. National Heart & Lung Institute, Imperial College, London, UK