1. 1Greenberg Division of Cardiology, Weill Cornell Medicine, New York, NY 10021, USA
2. 2Departments of Cardiology and Nephrology, Ullevaal Hospital, University of Oslo, N-0407 Oslo, Norway
3. 3Merck Research Laboratories, North Wales, PA 19454, USA
4. 2Departments of Cardiology and Nephrology, Ullevaal Hospital, University of Oslo, N-0407 Oslo, Norway 4Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI 48109, USA
5. 4Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI 48109, USA
6. 5Department of Clinical Science, University of Bergen, N-5020 Bergen, Norway