1. Department of Cardiology; University Medical Centre Groningen, University of Groningen; Hanzeplein 1 9713 GZ Groningen The Netherlands
2. Cardiovascular Division; Brigham and Women's Hospital; Boston MA USA
3. Medical University of South Carolina; RHJ Department of Veterans Affairs Meidcal Center; Charleston SC USA
4. Department of Internal Medicine and Cardiology; Charité University Medicine, Campus Virchow Klinikum and German Heart Center; Berlin Germany
5. University of Glasgow; Glasgow UK
6. University of Texas Southwestern; Dallas TX USA
7. Novartis Pharmaceuticals; East Hanover NJ USA