1. Department of Cardiology, Oslo University Hospital, Rikshospitalet , Sognsvannveien 20, 0372 Oslo , Norway
2. K.G. Jebsen Cardiac Research Center and Center for Heart Failure Research, Faculty of Medicine, University of Oslo , Kirkeveien 166, 0450 Oslo , Norway
3. Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford Cardiovascular Institute , 265 Campus Drive, Stanford, CA 94305 , USA
4. Department of Cardiology, Catharina Hospital , Eindhoven , The Netherlands
5. Department of Cardiology, Asan Medical Center, University of Ulsan College of Medicine , Seoul , Korea
6. Department of Cardiology, Sahlgrenska University Hospital , Gothenburg , Sweden
7. VA Palo Alto Health Care System , 3801 Miranda Avenue, Palo Alto, CA 94304 , USA