1. Department of Cardiology B2142, The Heart Center, Rigshospitalet, 9 Blegdamsvej, DK-2100 Copenhagen, Denmark,
2. Weill Cornell Medical College, New York, NY, USA
3. Merck Research Laboratories, North Wales, PA, USA
4. Institute of Medicine, University of Bergen and Department of Heart Disease, Haukeland University Hospital, Bergen, Norway